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My main interest for some time has been knowledge-based systems approaches
to problem solving in agriculture, but my background is in simulation and I
still do some modeling work on insect/crop systems. I am currently
coordinating an effort to implement a prototype whole farm planning system
called CROPS that helps farmers use crop rotation and sound soil, pest, and
nutrient management practices to achieve multiple goals in a multi-year
whole farm plan for a crop/livestock operation. We are using artificial
intelligence planning and scheduling methods to deal with this large
multi-objective problem. Because of this effort, I am very interested in
models that could help evaluate the risks of and the environmental
consequences of soil erosion, nutrient and pesticide runoff and leaching
from agricultural fields.
I also teach a modeling course for entomologists and have used Stella. I
find it to be an excellent teaching tool to get concepts of modeling across
to students. For example, I have found no better way to explain
distributed delays than to model them in Stella and watch as the animated
simulation shows the students how a cohort becomes distributed.
I've used Monte Carlo methods and have dabbled in chaos, so the recent
exchange about both was interesting to me. My experience with modeling
predator-prey systems using an individual level model has left me with the
conviction that chaos is probably inherent in most biological and
ecological systems, but that it is likely to be a high order chaos. If
ecological systems are characterized by high order chaos it can mean they
are unpredictable, but more important is the result that there is a range
of phase space within which the trajectory of the model (and presumably the
system) is unpredictable and highly dependent on intial conditions. The
range can be wide or narrow. If narrow enough, the chaos will not affect
the model's utility in a predictive mode. One real problem is that one
can't just "model chaos" or even be certain that it is chaos and not noise
that one sees in data. One has to build models as best one can and then
test them for chaotic behavior.
--Nick

-----------------------------------------------------------------
Nicholas D. Stone ISIS Lab
Department of Entomology Phone: (703) 231-6885
202 Price Hall FAX: (703) 231-9131
Virginia Tech Internet: nick@vt.edu
Blacksburg, VA 24060 BITNET: nstone@vtvm1
-----------------------------------------------------------------

Nicholas Stone:

> My experience with modeling
>predator-prey systems using an individual level model has left me with the
>conviction that chaos is probably inherent in most biological and
>ecological systems, but that it is likely to be a high order chaos.

I'd be a little cautious on the comment regarding biological systems.
Most of the chaos observed in solving PDEs might be descriptive of
the mathematics and the numerical solutions than of the "actual
system". At least this is how I feel about the papers by Lorenz.
Additionally, the predictor-prey system is modeled using continous
equations, when in fact the generational structure (in entomology
for example) is quite discrete.

Ranjan

>Nicholas Stone:
>
>> My experience with modeling
>>predator-prey systems using an individual level model has left me with the
>>conviction that chaos is probably inherent in most biological and
>>ecological systems, but that it is likely to be a high order chaos.
>
>I'd be a little cautious on the comment regarding biological systems.
>Most of the chaos observed in solving PDEs might be descriptive of
>the mathematics and the numerical solutions than of the "actual
>system". At least this is how I feel about the papers by Lorenz.
>Additionally, the predictor-prey system is modeled using continous
>equations, when in fact the generational structure (in entomology
>for example) is quite discrete.
>
>Ranjan

While I share your views on the chaos observed in PDE models of simple
systems, the chaos I observed was not in a PDE model but in a model of
predators and prey simulated as individuals interacting within an
environmental arena. The model was discrete, deterministic, and based on
individual actions including reproduction and predatory events. It was,
therefore, not a typically chaotic model. (Acutally, it was not developed
to explore chaos, but to try to find the root cause of complex dynamics
within a simple system.) The resulting dynamics were reasonable in both a
single species model and two-species model (that is, they looked very much
like a logistic and a two-species oscillation with noise), but they were,
in fact, deterministic and chaotic with a fractal dimension between 4 and
5.
In any case, in my readings and investigations, as I said, I have been left
with the conviction that chaotic dynamics can easily result from some very
elementary properties of real or simulated systems (a patchy environment,
for example), but that the chaos may or may not hide underlying dynamics.
--Nick

-----------------------------------------------------------------
Nicholas D. Stone ISIS Lab
Department of Entomology Phone: (703) 231-6885
202 Price Hall FAX: (703) 231-9131
Virginia Tech Internet: nick@vt.edu
Blacksburg, VA 24060 BITNET: nstone@vtvm1
-----------------------------------------------------------------

(I'm not sure why, but a direct post to dvorah@agri.huji.ac.il didn't
work, so here is a list post instead)

While not directly applicable you may find several of the programs thtat
acompany the ASAE textbook "Environment Control for Animals and Plants"
by L. Albright to be useful for this purpose. You may find that Prof.
Seginer at Technion has a copy and/or more information.

--
R.S. Gates, Ph.D. P.E. gates@aen.uky.edu
Associate Professor ph (606) 257-3000 x 208
208 Agricultural Engineering Building fax (606) 257-5671
University of Kentucky
Lexington, KY 40546-0276
USA

Hi, my name is Delmar Holmstrom. I currently am employed by
Agriculture Canada at Charlottetown Research Station in PEI.
My interests are in: use of a portable rainfall simulator to
evaluate the effect of residue levels on soil erosion; use of
a TDR to evaluate soil moisture under various levels of
residue and use of a cone penetrometer to evaluate soil
compaction.

At this time one of my colleagues has a special request. He
was wondering if anyone has information on available software
programs which record soil fertility/soil management/nutrient
budgets.

POSITION ANNOUNCEMENT

POSITION: Assistant Professor of Soil Science and Extension Specialist;
tenure-track, 11-month appointment (60% extension, 30% research,
10% teaching).

LOCATION: Department of Plant Science, University of Connecticut,
Storrs, CT 06269-4067.

EFFECTIVE DATE: Applications accepted until March 1, 1994 or until the
position is filled. Starting date is September 1, 1994.

QUALIFICATIONS: Ph.D. in Soil Science with specialization in soil fertility
and/or soil analysis. Demonstrated ability to conduct
research in this area, and ability to work with others in
developing multidisciplinary extension programs. Knowledge
of laboratory instrumentation and computers is required.

RESPONSIBILITIES: The appointee will be required to develop a
multidisciplinary extension program in soil analysis, soil
fertility and environmental quality in support of the
state's agricultural industries. The individual will serve
as Director of the Soil Testing Laboratory. The individual
will teach one course annually; a graduate level course in
soil analysis and one other course in soil science offered
in alternate years. The development of a fundable research
program is expected.

SALARY AND Salary competitive and commensurate with candidate's
BENEFITS: qualifications. The benefit package includes health
insurance, retirement, and group life insurance.

APPLICATION AND For further information please write or call. To apply,
INFORMATION: send letter of application, resume, university transcripts,
reprints of publications, and three letters of
recommendation to: Dr. Suman Singha, Head, Department of
Plant Science, U-67, 1376 Storrs Road, University of
Connecticut, Storrs, CT 06269-4067. Telephone 203/486-2924

The University of Connecticut is an
Affirmative Action/Equal Opportunity Employer

Cristian P. Schulthess
Internet: CSchulth@canr1.cag.uconn.edu * *
Phone: 203-486-1943 Fax: 203-486-0682 * =============== ***
Address: Univ. of Connecticut * Soil & *****
Dept. of Plant Science, U-67 ***** Environmental * ___
W.B. Young Bldg., Room 118 *** Chemist * +. .+
__________Storrs, CT 06269___________________* ================ *__ ( )
o

In , agmodels-l@unl.edu wrote:
>Received: from crcnis1.unl.edu by wigate.nic.wisc.edu;
> Tue, 04 Jan 94 12:17 CDT
>Received: by crcnis1.unl.edu id AA00632 (5.65c/IDA-1.4.4 for
> bland@vms2.macc.wisc.edu); Tue, 4 Jan 1994 12:14:58 -0600
>Message-Id: <01H7AAOABYBM0001NH@GW.AGR.CA>
>Date: Tue, 4 Jan 1994 12:14:58 -0600
>From: EM230PE@ncccot2.agr.ca
>Reply-To: agmodels-l@unl.edu

>At this time one of my colleagues has a special request. He
>was wondering if anyone has information on available software
>programs which record soil fertility/soil management/nutrient
>budgets.

The Soil and Plant Analysis Lab at UW-Madison has software that they
advertise as a "soil test recommendation and whole-farm nutrient
planning" tool. Nutrient needs of individual fields and manure
management for the whole farm are treated. It is designed for use by
consultants and state regulators, primarily, but could be used by
farmers. Current Wi regulatory standards for nutrient management are
incorporated. It costs $100; a brochure is available from Wisplan
Computing Services, 608/262-4552.

Dear members,

My name is Jintaek Kim and I'm currently working at Seoul National
University in my PhD. My M.S. topic was application of erosion and
sedimentation models to small watersheds, especially ANSWERS and
Modified USLE model.
Some of projects I was involved with were develpment of DSS in agricultural
water resource management, develpment of predictive models for deposits
and sediment yields at irrigation reservoirs..
My current interest is development of GIS/GRASS integrated NPS model,
especially in paddy area.

Have a happy New Year and another successful year.

Jintaek Kim

---------------------------------------------------
Address : Department of Agriculural Engineering
College of Agriculture and Life Sciences
Seoul National University
Suwon, 441-744, Korea
E-mail : sun00408@alliant.snu.ac.kr
---------------------------------------------------

On Thu, 6 Jan 1994 19:48:07 -0600 <snu00408@alliant.snu.ac.kr> said:
>Dear members,
>
> My name is Jintaek Kim and I'm currently working at Seoul National
> University in my PhD. My M.S. topic was application of erosion and
> ...

This is interesting. I have been considering trying GRASS. If you have a
little time I would like very much to hear what your experience with GRASS
has been. Just a few thoughts, anyway...

Don Wauchope, USDA-Ag Research Service
POB 748, Tifton, GA 31793
Don@Tifton.cpes.peachnet.edu

This message is just a test.
Feliks Landa

help

Just a test.
F. Landa

Just a test.
Feliks Landa

I am afraid we all need HELP, Felix.

+---------------------------------------++---------------------------------+
| Dr. Jon D. Hanson || Comm: (303)490-8323 |
| USDA, Agricultural Research Service || Fax: (303)490-8310 |
| Great Plains Systems Research || jon@gpsrv1.gpsr.colostate.edu |
| 301 S. Howes, P.O. Box E || FTS2000: a03jonhanson |
| Fort Collins, Colorado 80522 || |
+---------------------------------------++---------------------------------+

We use GRASS extensively at our unit (if you are interested).

+---------------------------------------++---------------------------------+
| Dr. Jon D. Hanson || Comm: (303)490-8323 |
| USDA, Agricultural Research Service || Fax: (303)490-8310 |
| Great Plains Systems Research || jon@gpsrv1.gpsr.colostate.edu |
| 301 S. Howes, P.O. Box E || FTS2000: a03jonhanson |
| Fort Collins, Colorado 80522 || |
+---------------------------------------++---------------------------------+

On Fri, 7 Jan 1994 16:59:54 -0600 Jon D. Hanson, (303)490-8323 said:
>We use GRASS extensively at our unit (if you are interested).
>
That's nice to know--I'm going to pay you a visit next time I come out to see
Laj

Hello world,

my name is Georg Hoermann, I am an agricultural engineer working at
the "Ecosystem Research Center" at Kiel University (mainly
coordination).
I am interested in hydrology, global change effects on ecosystems,
object oriented modelling (mainly smalltalk) and user interfaces.
This strange mixture comes from my personal history: I began with
ph.d. work in hydrology/soil science (mainly flow in macropores,
cracking soils) an got in contact with OOPS (Simula, later
Smalltalk). I am now trying to introduce concepts of oops into our
biological
research (individual oriented modelling, CA, L-Systems). From there I
run into problems of complexity (ever tried to model an ecosystem?)
and was fascinated by artificial life theory and individual oriented
models.
The most important problem for me in this context is that object
oriented approaches are difficult to introduce in a pure FORTRAN-shop.
I always dreamed of an object oriented modelling framework that is
easily extendible and has a good user interface.
My interest in user interfaces comes from my teaching experience: I
think the *real* reason why models are not applied is the interface and
not the contents. There are nearly thousands of hydrologic models but
none of them can be used by our biologists. Students can work with a
graphics package or a spreadsheet within a week, but if it comes to
modelling they have to deal with really awkward FORTRAN formatting
codes.
Global change research is applied complex-systems research and
that's where
I am actually: I am trying to link the different components of *real*
ecosystems together.
A more private interest is a artificial life philosophy. I think that alife will
have
substantial influence on the way we think about life, ourself, mankind,
intelligence (and the universe, naturally 8-).
Even more private is my interest in classical music and
telecommunication (WWW, creative use of the internet).

Gruss Georg

Georg Hoermann - georg@geki.toppoint.de, schorsch@pz-oekosys.uni-kiel.d400.de
Ecosystem Research Center - Kiel University
Schauenburger Str. 112 - D-24118 Kiel

I am very much interested in learning about the experiences
people have in using ARC/INFO, GRASS, IDRISI, ERDAS or any other GIS
Software in estimating regional evapotranspiration. I will appreciate
receiving a list of publications on this topic.

Yours sincerely,

GAJENDRA SINGH
Professor and Coordinator
Agricultural & Food Engineering Program
School of Environment, Resources and Development
Asian Institute of Technology
GPO Box 2754, Bangkok 10501, THAILAND

TEL: (66-2)524 5450 * FAX: (66-2)524-6200, 516-2126
INTERNET: singhg@emailhost.ait.ac.th
----------------------------------------------------------------------

On Tue, 18 Jan 1994 04:41:26 -0600 Prof. G. Singh said:
>
> I am very much interested in learning about the experiences
>people have in using ARC/INFO, GRASS, IDRISI, ERDAS or any other GIS
>Software in estimating regional evapotranspiration. I will appreciate
>receiving a list of publications on this topic.
>
>
>Yours sincerely,
>
>GAJENDRA SINGH
>Professor and Coordinator
>School of Environment, Resources and Development

Me too.
>Asian Institute of Technology
>GPO Box 2754, Bangkok 10501, THAILAND
>
>TEL: (66-2)524 5450 * FAX: (66-2)524-6200, 516-2126
>INTERNET: singhg@emailhost.ait.ac.th
>----------------------------------------------------------------------
>

24TH ANNUAL WORKSHOP ON CROP SIMULATION

SECOND CALL FOR PAPERS

The 24th Annual Workshop on Crop Simulation will be held on
March 15-18, 1994 in Raleigh, North Carolina. This workshop is
organized by the Biological Systems Simulation Group and co-
sponsored by North Carolina State University (Gail Wilkerson,
see address below), the USDA Crops Research Lab (Sally Schneider,
phone 919-693-5151 ext 256, e-mail SSCHNEIDER@asrr.arsusda.gov),
and Division A3 (Agroclimatology and Agronomic Modeling) of the
American Society of Agronomy.

The workshop will start with registration on the evening of
March 15, and conclude at noon on March 18. However, a miniworkshop
on multispecies modeling will be held on the afternoon of March 18.
See the preliminary program below for more details about the
schedule.

The workshop will consist of invited and volunteered papers as
well as a software demonstration and poster section. An open
discussion (free-for-all) is scheduled for one evening. Invited
papers will address the role of modeling in sustainable agriculture
from the viewpoint of a plant modeler, a plant pest modeler, a
soils/water/chemical fate and transport modeler, the Soil
Conservation Service, an economist, and a farmer.

Volunteered papers, posters, and software demonstrations are
requested on topics dealing with the development of simulation
models or components as well as their applications in research,
agricultural education, systems analysis of cropping options and
environmental quality studies. Papers on a broad range of topics
related to the simulation of biological systems are welcome.
Please submit a one-page abstract by February 16, 1994 to:

Gail G. Wilkerson
Crop Science Department
North Carolina State University
Raleigh, NC 27695-7620
Phone: (919) 515-5816 Fax: (919) 515-7959
E-mail: ggwilker@csemail.cropsci.ncsu.edu

If possible, submit your abstract on floppy disk (WordPerfect,
Word, or ASCII format), as well as in a hard copy. Or send it by
e-mail in ASCII format, as well as by mail. We will attempt
to standardize appearance of the abstracts included in the
Proceedings. Abstracts should fit on one page, single-spaced, with
one-inch margins, and type no smaller than 10 point. Include
authors' affiliations and addresses at the top of the abstract.
Please state in a cover letter whether you wish to present the
paper orally, in poster form, or as a software demonstration (indicate
hardware requirements). We may be unable to honor all format requests or
schedule all papers that are submitted. All abstracts which are
submitted by February 16 will be included in the Proceedings of the Workshop.

The Workshop will be held at the Brownestone Hotel, 1707
Hillsborough Street, Raleigh, North Carolina (NC 1-800-331-7919,
Outside NC 1-800-237-0772, or 919-828-0811). A block of rooms has
been reserved in the name of "Crop Simulation Workshop" at the
special rate of $48.00 single/$54.00 double + 12% tax. You should
make your hotel reservations by February 23, 1994 to obtain the
Workshop rate. The hotel provides a free shuttle service to and
from the Raleigh-Durham International Airport. The Velvet Cloak Inn
(NC 1-800-662-8829, or 919-828-0333) is next door to the Brownestone
Hotel and has rooms at the rate of $59.00 + 12% tax if you indicate that
you are with North Carolina State University.

A registration fee of approximately $60.00 will cover the cost
of the catered barbecue dinner, welcome reception, meeting room
fees, proceedings, poster rentals, and other ancillary expenses.

TENTATIVE PROGRAM

Tuesday, March 15, 1994 - Brownestone Hotel

7:00 - 9:00 pm Registration

Wednesday, March 16 - Brownestone Hotel

7:00 - 8:00 am Registration

8:00 - 12:00 Plenary Session on Sustainable Agriculture -
Invited speakers

1:15 - 5:15 pm Volunteered papers (15 minutes each)

6:00 - 8:00 pm Welcome reception - hors d'oeuvres, cash bar

Thursday, March 17 - 2405 Williams Hall, NCSU Campus

8:00 am - 12:00 Posters and software demonstrations

1:00 - 2:30 pm Volunteered papers (15 minutes each)

2:30 - 5:00 pm Choice of tours

6:30 - 9:00 pm Catered barbecue dinner and open discussion. Bring
a slide or two about whatever topic you wish to
discuss.

Friday morning, March 18 - Brownestone Hotel

8:00 am - 12:00 Volunteered papers (15 minutes each)

Friday afternoon, March 18 - Miniworkshop on Multispecies Modeling -
2405 Williams Hall, NCSU campus

1:30 - 4:30 pm This workshop is being organized by Bob Caldwell. If
you wish to submit an abstract for this workshop and
want it published in the Proceedings of the Crop
Simulation Workshop, then send it to Gail Wilkerson
by February 16. Indicate in your cover letter that
it is intended for the Miniworkshop on Multispecies
Modeling. For more information about this miniworkshop
contact Dr. Bob Caldwell, Agricultural Engineering
Department, Frazier Rogers Hall, University of Florida,
Gainesville, FL 32611; phone (904) 392-7719,
FAX (904) 392-4092, E-mail caldwell@water.agen.ufl.edu.

PLEASE POST AND/OR CIRCULATE AMONG INTERESTED COLLEAGUES

Dear Agmodelers,

I have had a request from a colleague who is working with buried
trickle irrigation tape and is using data aquisition along with
pressure transducer equipped tensiometers and TDR to get time
series of 2-D soil water tension about the drip tape. She has
collected beaucoup data (as you can imagine from a grid of
tensiometers collecting tension information every 1/2 hr.!) and
would like to compare this data with some simulations. What
programs are available? I know of SUTRA & SWMS-2D and was
wondering what else is available. Also how could one get copies
of the afore mentioned programs? Dennis Timlin, are you there? I
hear you have a model...

Thanks in advance,

Jerome Pier
jp@unl.edu

>
>Dear Agmodelers,
>
>I have had a request from a colleague who is working with buried
>trickle irrigation tape and is using data aquisition along with
>pressure transducer equipped tensiometers and TDR to get time
>series of 2-D soil water tension about the drip tape. She has
>collected beaucoup data (as you can imagine from a grid of
>tensiometers collecting tension information every 1/2 hr.!) and
>would like to compare this data with some simulations. What
>programs are available? I know of SUTRA & SWMS-2D and was
>wondering what else is available. Also how could one get copies
>of the afore mentioned programs? Dennis Timlin, are you there? I
>hear you have a model...
>
>Thanks in advance,
>
>Jerome Pier
>jp@unl.edu
>
>
Jerome had asked me to post information about our 2D model some time ago and I see
that this is a good time to do it. This may be a little too long but I wanted it to be
informative.

At the Systems Research Lab here in Beltsville, in collaboration with the Salinity
Lab in Riverside, California, we have been developing a two dimensional, finite element
water and solute transport model that is linked to plant growth. The water and solute
transport code is from SWMS_2D and the plant code is from GLYCIM, a soybean simulator. The
model is known as 2DSOIL. 2DSOIL can be used to simulate water and chemical movement in
soils as well as plant root growth and water uptake. 2DSOIL will also be useful to plant
modelers as a comprehensive soil simulator for use with plant models that simulate above
ground plant growth and development processes. It was specifically designed as a soil
simulator for plant modelers to attach to their plant models.
Dr. Yakov Pachepsky, a visiting scientist at our lab, did most of the work on
developing a structure for the combined model, modified the existing code to interface the
two models, and added other code. The modified code employs a modular structure that
allows modelers to build a simulation model from a number of subroutines. The model can be
as complex or as simple as you desire. Version 02 of 2DSOIL contains a very flexible set
of modules to simulate, in two dimensions, water , solute and heat transport, and root
growth and water uptake by plants. The modules interact on the spatial-temporal grid that
covers the soil profile and the simulated time interval. This interaction is provided by
control modules. Two-dimensional finite element approximations of mass and energy
conservation equations are used to model the soil transport processes. The modules in the
current version include: (a) control modules (b) water, solute, heat, and gas modules (c)
chemical interaction modules (d) root growth and water uptake modules, and (e)
soil-atmosphere interaction module.
Users should feel free to modify any modules or add new modules according to their
needs. As explained in the documentation, modules can easily be added to carry out a
management process or to make other changes in the simulation scenario without the need
for major changes in the main code. The documentation includes examples and instructions
for adding customized modules.
We are continuing to test, expand, and improve the model and encourage you to
contact us if you have any suggestions or comments for improvement, or encounter any
problems. Please see the ReadMe.Txt file in the distribution files for more information.
If you do not have a FORTRAN compiler and wish to use only the executable version we can
supply a copy of DBOS, the DOS extender required to run the model.
The model is available via FTP from ASRR.ARSUSDA.GOV. Log in as anonymous and give
your mail address as a password. The file is a self-extracting PKZIP file. Read the
read-me file about tips on extracting all the files to subdirectories. The documentation
is included but without figures. We can supply the figures or a hardcopy of the
documentation if anyone desires.

------------------------------------------------
Dennis Timlin
Yakov Pachepsky
USDA-ARS Systems Research Lab
Beltsville, MD 20705
301-504-6255
DTimlin@ASRR.ARSUSDA.GOV
YPachepsky@ASRR.ARSUSDA.GOV

Dear netters:

I'm seeking information/manual on AGNPS model.
Bibliographic references articles or other publications are much appreciated.
Make a nice weekend and thanks in advance for any helps.

Jintaek Kim

---------------------------------------------------
Address : Department of Agriculural Engineering
College of Agriculture and Life Sciences
Seoul National University
Suwon, 441-744, Korea
E-mail : sun00408@alliant.snu.ac.kr
---------------------------------------------------

Please repost with a 65 character (approx) margin for readability!
--
R.S. Gates, Ph.D. P.E. gates@aen.uky.edu
Associate Professor ph (606) 257-3000 x 208
208 Agricultural Engineering Building fax (606) 257-5671
University of Kentucky
Lexington, KY 40546-0276
USA

On Fri, 21 Jan 1994 16:33:36 -0600 jerome pier said:
>Dear Agmodelers,

I don't know if Timlin is still at ARS/Beltsville but the systems lab
there has a model called "2DSOIL" which simulates soil and plant processes
in 2D. Try contacting bacock@asrr.arsusda.gov
>
>I have had a request from a colleague who is working with buried
>trickle irrigation tape and is using data aquisition along with
>pressure transducer equipped tensiometers and TDR to get time
>series of 2-D soil water tension about the drip tape. She has
>collected beaucoup data (as you can imagine from a grid of
>tensiometers collecting tension information every 1/2 hr.!) and
>would like to compare this data with some simulations. What
>programs are available? I know of SUTRA & SWMS-2D and was
>wondering what else is available. Also how could one get copies
>of the afore mentioned programs? Dennis Timlin, are you there? I
>hear you have a model...
>
>Thanks in advance,
>
>Jerome Pier
>jp@unl.edu
>

> From root@crcnis1.unl.edu Sat Jan 22 12:23:17 1994
> Date: Sat, 22 Jan 1994 11:18:46 -0600
> Originator: agmodels-l@unl.edu
> Reply-To: <agmodels-l@unl.edu>
> Sender: agmodels-l@unl.edu
> Version: 5.5 -- Copyright (c) 1991/92, Anastasios Kotsikonas
> From: snu00408@alliant.snu.ac.kr
> To: Multiple recipients of list <agmodels-l@unl.edu>
> Subject: AGNPS model
> Content-Length: 533
>
> Dear netters:
>
> I'm seeking information/manual on AGNPS model.
> Bibliographic references articles or other publications are much appreciated.
> Make a nice weekend and thanks in advance for any helps.
>
> Jintaek Kim
>
>
> ---------------------------------------------------
> Address : Department of Agriculural Engineering
> College of Agriculture and Life Sciences
> Seoul National University
> Suwon, 441-744, Korea
> E-mail : sun00408@alliant.snu.ac.kr
> ---------------------------------------------------
>

Information on the AGNPS model can be obtained from:

USDA-ARS-MWA
North Central Soil Conservation Research Laboratory
Attn: Basil Meyer
North Iowa Avenue
Morris, MN 56267

Phone: (612) 589-3411
FAX: (612) 589-3787

INTERNET address: usda_ars@caa.mrs.umn.edu

Dennis Flanagan
USDA-ARS-MWA NSERL (flanagan@ecn.purdue.edu)

Dear Jintaek Kim:

Since my message to you bounced, I'll post this
to the list.

In response to your request for references regarding
AGNPS, here is a short list. These deal with the use of AGNPS
linked with a GIS. If some sound particularly
interesting and you have difficulty getting hold of them,
let me know and I might be able to mail a copy to you.

Hession, W. C. 1990. Geographic information system technology
and water quality modeling: an interface. In: Application of Geographic
Information Systems, Simulation Models, and Knowledge-based Systems
for Landuse Management, 339-349. Department of Agricultural
Engineering, VPI&SU, Blacksburg, VA.

Yoon, J., G. Padmanabhan, and L. H. Woodbury. 1993. Linking
agricultural nonpoint source pollution model (AGNPS) to a
geographic information system (GIS). In: Proceedings of the
Symposium on Geographic Information Systems and Water Resources,
eds. J. M. Harlin and K. Lanfear, 79-87. AWRA, Bethesda, MD.

Brown, S. J. and and B. A. Engel. 1993. A comparison of GIS
assistedsimulated hydrologic response with actual storm event data.
In: Advances in Hydro-Science and -Engineering, Volume I, Part A,
ed. S.S.Y. Wang, 511-517. Center for Computational Hydroscience
and Engineerong, University of Mississippi, University, MS.

He, C., J. F. Riggs, and Y. T. Kang. 1993. Integration of
geographic information systems and a computer model to evaluate the
impacts of agricultural runoff on water quality. pp. 61-70 of the
AWRA proceedings listed above.

Mitchell, J. K., B. A. Engel, R. Srinivasan, R. L. Bingner, and S.S.Y. Wang.
1993. Validation of AGNPS for small, mild topography watersheds using
an integrated AGNPS/GIS. pp. 503-510 of the "Advances in Hydro-Science..."
listed above.

Sharyl E. Walker
Department of Agricultural Engineering
University of Illinois
guernsey@holstein.age.uiuc.edu

>
>Please repost with a 65 character (approx) margin for readability!
>--
This is a repost, I hope this is better.

Jerome had asked me to post information about our 2D model
some time ago and I see that this is a good time to do it.
This may be a little too long but I wanted it to be
informative.
At the Systems Research Lab here in Beltsville, in
collaboration with the Salinity Lab in Riverside, California,
we have been developing a two dimensional, finite element
water and solute transport model that is linked to plant
growth. The water and solute transport code is from SWMS_2D
and the plant code is from GLYCIM, a soybean simulator. The
model is known as 2DSOIL. 2DSOIL can be used to simulate
water and chemical movement in soils as well as plant root
growth and water uptake. 2DSOIL will also be useful to plant
modelers as a comprehensive soil simulator for use with plant
models that simulate above ground plant growth and development
processes. It was specifically designed as a soil simulator
for plant modelers to attach to their plant models.
Dr. Yakov Pachepsky, a visiting scientist at our lab, did most
of the work on developing a structure for the combined model,
modified the existing code to interface the two models, and
added other code. The modified code employs a modular
structure that allows modelers to build a simulation model
from a number of subroutines. The model can be as complex or
as simple as you desire. Version 02 of 2DSOIL contains a very
flexible set of modules to simulate, in two dimensions, water
, solute and heat transport, and root growth and water uptake
by plants. The modules interact on the spatial-temporal grid
that covers the soil profile and the simulated time interval.
This interaction is provided by control modules.
Two-dimensional finite element approximations of mass and
energy conservation equations are used to model the soil
transport processes. The modules in the current version
include: (a) control modules (b) water, solute, heat, and gas
modules (c) chemical interaction modules (d) root growth and
water uptake modules, and (e) soil-atmosphere interaction
module.
Users should feel free to modify any modules or add new
modules according to their needs. As explained in the
documentation, modules can easily be added to carry out a
management process or to make other changes in the simulation
scenario without the need for major changes in the main code.
The documentation includes examples and instructions for
adding customized modules.
We are continuing to test, expand, and improve the model and
encourage you to contact us if you have any suggestions or
comments for improvement, or encounter any problems. Please
see the ReadMe.Txt file in the distribution files for more
information. If you do not have a FORTRAN compiler and wish to
use only the executable version we can supply a copy of DBOS,
the DOS extender required to run the model.
The model is available via FTP from ASRR.ARSUSDA.GOV. Log in
as anonymous and give your mail address as a password. The
file is a self-extracting PKZIP file. Read the read-me file
about tips on extracting all the files to subdirectories. The
documentation is included but without figures. We can supply
the figures or a hardcopy of the documentation if anyone
desires.

Dennis Timlin
Yakov Pachepsky
USDA-ARS Systems Research Lab
Beltsville, MD 20705
301-504-6255
DTimlin@ASRR.ARSUSDA.GOV
YPachepsky@ASRR.ARSUSDA.GOV

cross posted to devel-l@american,edu, sanet-mg@.csc.ncsu.edu,
sustag-public@twosocks.csc.ncsu.edu, mgarden@wsuvm1.csc.wsu.edu,
sustag-l@wsuvm1.csc.wsu.edu, agric-l, models-l@unl.edu

Subject: access to internet for rural Americans

I have been looking into economical ways for rural Americans
to access internet if they don't have access through a local
call to a university internet computer. Access by long
distance phone call can easily incur $10-20.00/hr long
distance charges depending on the time of the call in
addition to whatever the internet access provider charges for
on-line time (often $1-2.00/hr) if you go with a commercial
access provider. This makes internet too expensive for
extensive use for most people in small towns. Some local
providers, however, offer extremely low-priced access, i.e.
unlimited use for $200-300/yr. Many local providers are
listed in the PDIAL file available over Internet. To get
PDIAL, send the message "Send PDIAL" to
info-deli-server@netcom.com and it will be sent back to your
email box.

The two most economical sources that I have found are
(1) Tyrell.net if you live in one of the numerous cities with
local access to SprintNet (50,000+ population in my area of
Eastern Washington) or (2) - for most rural Americans who
don't have local access to SprintNet - netIOWA, for 1-800
access from anywhere in the US (mentioned in the most recent
issue of Ag/Innovator magazine, call 1-800-808-2828 for a
free sample issue - its a neat magazine for modern farmers).

TYRELL

Tyrell.net charges $10.00/mo + $1.00/hr for SprintNet if they
have a local SprintNet access number in your area. Call
1-800-989-7351 for information on towns with local access
numbers and for account information. Signup fees are about
$31.00. If they don't have a local access number, it becomes
much more expensive.

netIOWA

netIOWA has 3 options:
1. Measured 800 Service - "Portable Internet"
$0.10 / minute - unlimited usage, 800-number access only
2. Des Moines Local Calling Area Plan
$30 / month - unlimited usage, local dialup number only
(This does include telnet access)
3. Telnet Only (to INFOnet)
$20 / month - unlimited usage
4. UUCP Only
$20 / month - unlimited usage, local dialup number only

If you don't have local SprintNet access, option 1 is the most
economical 1-800 internet access that I have seen. Call
1-800-546-6587 for more information.

If anybody finds anything better, please post it. Mean while
please share this with your rural friends interested in
exploring the information highway.

Tom Hodges

Tom Hodges Cropping Systems Modeler ___ ___
USDA-ARS / \_/ \
Rt. 2, Box 2953-A Telephone: 509-786-2226 | |
Prosser, WA 99350 \______/^\/
USA potato tuber
thodges@beta.tricity.wsu.edu thodges@asrr.arsusda.gov
=====================================================================
...photosynthesis makes the world go around... Mr. Potato Head

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