潮白河生态补水对密云水库下游河道水质影响分析

Analysis on the impact of ecological water replenishment of Chaobai River on the water quality of the lower reaches of Miyun Reservoir

为探讨2021年春季潮白河试验性生态补水对密云水库下游河道水质影响,分析了生态补水期间过流河道的水质变化情况,结果表明:潮白河试验性生态补水加快了密云水库下游潮河和白河水体流动速度,有效降低了河道水体温度;补水后期,双井监测站水体溶解氧较补水前期增幅为20.2%;双井及宁村监测站水体化学需氧量降幅分别高达61.1%、51.0%;生态补水降低了潮河水体中无机酸、碱或盐浓度,使潮河河道水体自净能力显著增强。本研究为优化潮白河生态补水长期规划、保障生态补水安全提供技术支撑。

In order to explore the impact of experimental ecological water replenishment of Chaobai River on the water quality of the downstream of Miyun Reservoir in spring 2021,this paper analyzes the water quality changes of downstream of Miyun Reservoir during the period of ecological water replenishment.The results show that the experimental ecological water replenishment of Chaobai River accelerates the flow speed of Chaohe River and Baihe River,and effectively reduces the water temperature of the river channel.In the later stage of water replenishment,the dissolved oxygen increased by 20.2%compared with the earlier stage of ecological water replenishment.The chemical oxygen demand of Shuangjing and Ningcun monitoring stations decreased by 61.1%and 51.0%.Ecological water replenishment reduces the content of inorganic acid,alkali or salt in the water of Chaohe River,and significantly enhances the self purification capacity of chaoihe River through reasonable ecological regulation.This study aims to optimize the long-term ecological water replenishment planning of Chaobai River and establish a strategic water resources reserve in North China,providing technical support to ensure the safety of ecological water replenishment.