Watershed

Oral

394134 - Application of RSM to simulate 1-D and 2-D regional floods and droughts in the Kissimmee Basin

Thursday, June 7
10:30 AM - 12:00 PM
Location: Skyway Room
Co-Authors: Wasantha Lal, 3301 Gun Club Rd., West Palm Beach, FL 33406 – South Florida Water Management District; Walter Wilcox, 3301 Gun Club Rd., West Palm Beach, FL 33406 – South Florida Water Management District

State water management agencies responsible for managing water in large hydrologic systems have to use large scale fully integrated numerical models to prevent numerical errors introduced when separate groundwater, surface water, and 1-D canal flows are integrated. The Regional Simulation Model (RSM) developed by SFWMD is fully integrated by considering all flow elements including 1-D and 2-D groundwater and surface water elements as water body objects with different characteristics and solving all the equations simultaneously. Various hydrologic properties are embedded into these finite-volume objects, and object oriented methods are used to organize various interactions within the objects within the hydrologic system.
In the current application of RSM to the Kissimmee basin, full St Venant’s equations integrated with 2-D surface and GW systems are used to simulate the system. The model is calibrated with a focus of attributing known hydrologic responses to targeted parameters in both the model and the physical system. Every attempt is made to limit the physical parameters to those that can be calibrated in this manner to direct responses. The soil storage coefficients moisture movement in the model are calibrated using measured water table responses to rainfalls. The recession rate is calibrated using transmissivity, etc. The results show that the calibration can be successful with a smaller number of measurable parameters, which is important in large watersheds without adequate data records.

Randy J. Van Zee, MS

Principal Scientist
South Florida Water Management District

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394134 - Application of RSM to simulate 1-D and 2-D regional floods and droughts in the Kissimmee Basin



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