人工挖沙对东江水系水动力及环境影响分析

根据东江水域的水文、水动力特征，建立了感潮水系水动力数学模型，分别在丰、枯水期相应的水文设计条件下，重点模拟、分析了人工挖沙可能对水文情势产生的影响．结果表明，人工挖沙必然引起河势的变化，进一步引起水位的降低及其他水文情势的改变，并可能破坏地表水与地下水补给平衡，潮汐地区成、淡水平衡，对河道的航运功能、取水功能、水利功能、生态环境功能等产生影响．

Impact of artificial sand excavation on hydrodynamics and water environment of Dongjiang River network

Based on the hydrological and hydrodynamic characteristics of the Dongjiang River network, a hydrodynamic numerical model was developed for tidal river networks. The present study focused on the impact of artificial sand excavation on hydrological regime under different hydrological conditions during high and low water level periods. The results show that artificial sand excavation will result in some variations of river regime, such as lowering water level and breaking the balance of surface water and groundwater recharge and the balance of salt and fresh water in tidal regions. Besides, it will bring some influences on the functions of the river channel in navigation, water intake, water conservancy, and ecological environment.