Evaluation of a Cooling Lake Fishery. Volume 2. Lake Sangchris Ecosystem Modeling. Final Report

摘要

Volume 2 is a description of the Lake Sangchris ecosystem modeling experience with a discussion of the theories, supportive data, and mathematical formulations used in development of the models. The structure and function of each of the resulting two major systems of differential equations, the physical model (TEMP) and the mainly biological Cooling Lake Ecosystem Model (CLEM), are fully documented TEMP is a relatively simple model of Lake Sangchris that computes temperature and changes in water volume in shallow and deep water areas of each of four large sections of the lake. The calculations are based on energy and mass inputs and losses and the results, along with some meteorological data, become the forcing functions of CLEM. CLEM is comprised of a series of submodels that define phosphorus, detritus, phytoplankon, periphyton, macrophyton, zooplankton, benthos, and fish dynamics. Mass is conserved within and between compartments. Transfers are generally food-consumer interactions, mortality, and recruitment. Numbers are also conserved in the fish submodel. Physiological processes provide the primary level of description in CLEM. Tests of various parts of TEMP and CLEM and comphrehensive tests of each total system were used to validate the models and to test their analytical responses. (ERA citation 05:018034)