Journal of Food, Agriculture and Environment

Simulation on water flow and water quality in Wuliangsuhai Lake using a 2-D hydrodynamic model

Author(s):

Qingling Shi ^{1, 2}, Jinyan Zhan ²*, Feng Wu ^{2, 3}, Xiangzheng Deng ^{3, 4}, Lirong Xu ¹

Recieved Date: 2012-02-09, Accepted Date: 2012-05-08

Abstract:

In order to study the hydrologic characteristics and water quality of Wuliangsuhai Lake, this paper combined measured monitoring data such as water flow, velocity, water depth and wind speed data with spatial data, developed the hydrodynamic model suitable for Wuliangsuhai to simulate its water flow and water quality, based on lake two-dimensional water hydrodynamic model. The water quality state variables in this model included TN and TP. The simulation of the mass transformation processes of TN and TP was based on the unsteady diffusion equations. First we made a coordinate transformation on control equations under Cartesian coordinates, then discretized equations of the model with alternating direction implicit method (ADI method) and solved the equations by LU decomposition. This study applied the sliding boundary method to process Body-Fitted Grid, which improved the regional orthogonal precision, and accelerated iteration convergence ratio obviously. The results showed that in Wuliangsuhai, the winddriven current was an important presentation of lake current, while the concentration of water quality item was decreasing from drains to surround because of the external pollutant loading. The simulation also showed that, the convection was the main process in water drains of the lake and pollutants spread out from water inlet to the lake area through convection diffusion in Wuliangsuhai watershed and it would take a relatively long time for concentration field to achieve a stable status and its self-purification ratio is quite slow. The simulated result could be used to quantitative study of water quality changes in lakes pollution process, and has an important significance for the comprehensive management of ecological restoration of the water environment.

Keywords:

Wuliangsuhai, two-dimensional water hydrodynamic model, concentration field

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 973-975

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