水口大坝坝址环境水部分水质指标的现场测定及其分析

IN-SITU MEASUREMENT AND ANALYSIS OF WATER QUALITY VARIABLES AROUND SHUIKOU DAM SITE

蓄水条件下,坝址环境水质的形成及其演变是自然及人为双重因素综合影响下的产物。正是这些因素的影响,区内水质、尤其是地下水质的时-空分布特征复杂多变。文中以一水电工程为例,对枢纽区环境水尤其是对大坝灌浆廊道及排水廊道各排水孔位地下水的pH值、总溶解固形物、电导率以及水温等进行了现场测定。据此,圈定出区内水化学的正、负异常区,并对其工程示踪意义进行了揭示。进行水质指标的现场测定,不仅有助于全面反映区内水化学场的基本特征,分析坝踵帷幕体的防渗性能,而且还有助于对现有水质监测点的位置进行优化意义上的调整。

The formation and evolution of environmental water quality around a dam site are greatly influenced by both natural and human factors. These factors make the temporal and spatial distribution of water quality very complicated within the area. So it is difficult to do water quality analysis in lab to reveal the real in-situ water quality behavior due to insufficient sampling points. In-situ measurement of some water quality variables, i.e. pH value, total dissolved solids, Ec(conductivity) and water temperature from point to point, is carried out for a project. According to a series of data, the sub-areas of abnormal water quality are identified, and furthermore, their tracing significance to engineering is revealed. It is considered that in-situ measurement of water quality variables is useful not only for reflecting water quality characteristics, but for optimal analysis of an existing water quality monitoring network as well.