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E. Data Analysis and Synthesis Team - PD/A CRSP 14th Annual Administrative Report
PD/A CRSP Fourteenth Annual Administrative Report
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IV. Abstracts of Technical Reports

E. Data Analysis and Synthesis Team Abstracts

Aquaculture Pond Modeling for the Analysis of Integrated Aquaculture/Agriculture Systems: Fishpond Organic Matter and Nitrogen Dynamics

Interim Work Plan, DAST Study 5

Daniel M. Jamu and Raul H. Piedrahita
Biological and Agricultural Engineering Department
University of California
Davis, USA

Abstract

Modifications to a model for simulating integrated aquaculture-agriculture systems described previously are presented in this report. The changes described relate to the simulation of organic matter concentration and of nitrogen dynamics. Processes taking place in the sediments are considered in both the organic matter and nitrogen models, and the models are described in some detail. Sample simulations are presented, and the rates of organic matter accumulation in the water column and sediments, of nitrate accumulation, and of fish growth are discussed.

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Modeling of Temperature and Dissolved Oxygen in Stratified Fish Ponds using Stochastic Input Variables

Interim Work Plan, DAST Study 4

Zhimin Lu and Raul H. Piedrahita
Biological and Agricultural Engineering Department
University of California
Davis, USA.

Abstract

A model of water temperature, dissolved oxygen (DO), and fish growth in stratified fish culture ponds has been developed and described in previous reports. The model uses stochastically-generated weather parameters as inputs. Two major modifications to the model are described in this report: the procedure for generating daily and hourly solar radiation data has been changed; and oxygen consumption by nitrification was separated from the water column respiration term. In the previous version of the model, the procedure for generating solar radiation values was based on the mean and variance of historical data for each day. Simulation results are presented for temperature, dissolved oxygen, and fish growth. All results are presented as mean, maximum, and minimum values for the output variables obtained after 20 simulations that spanned a period of over 80 days. Temperature and dissolved oxygen values are shown for three depths in the pond: surface water, mid-depth, and bottom water.

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