水电工程干扰下饮用水水源地的水质风险评估

采用数值模拟方式预测和评估水电工程对其影响区内饮用水水源地的水质风险，其目的在于辨析工程对取水水质安全的影响。以汉江上游待建旬阳水电站库区内水源地为例，建立二维水流和水质数学模型，分析了水域水动力学和水质变化特征，选取最不利方案进行水质风险评估，并从水体水动力特征和营养状态判别了富营养化风险程度。研究表明：工程兴建后水源地水域水流变化和取水口临近支流潜在污染源的威胁，水质遭受污染的风险增大，在月河水质超标及特定水库运行条件下许家台取水口水质无法保障。同时，水域富营养化水平相比建库前并没有显著的提高。研究可为水电开发涉及水源地项目的水环境影响分析提供理论依据

WATER QUALITY RISK ASSESSMENT OF DRINKING WATER SOURCE ZONE DISTURBED BY HYDROELECTRIC POWER PROJECTS

The numerical simulation method is applied to predict and assess water quality risk for drinking water sources disturbed by hydroelectric projects,and the objective is to identify the influence of such projects.The case study was a drinking water source within the planned XunYang Reservoir at the upper reach of the Hanjiang River.A 2 dimension water flow and water quality model was constructed.The propertied of hydrodynamics and water quality were analyzed,and the worst scenario was used for risk assessment.The hazard of eutrophication was evaluated by the flow and tropic states.The results indicated that,the inlet for drinking water would be under the threat from a nearby tributary (the Yue River) after the construction of the project,and the risk of drinking water pollution would be increased.Required drinking water quality would not be satisfied if the water quality in the tributary did not meet the standards under certain reservoir operation scenarios.However,the tropic level of water would not be significantly influenced by the project.This study could be applied for similar projects for water quality assessment.〖