To reduce the harm of water contamination incidents in drinking water source areas (DWSAs) and explore feasible approaches, the research developed a hydrodynamic water quality model for DWSAs based on two dimensional water quality and quantity equations, Geographic Information System (GIS), and Digital Elevation Model (DEM). The Heshangshan Drinking Water Source Area (HDWSA) in the Three Gorges Reservoir Area (TGRA) was selected as the research area, with total phosphorus (TP) as the representative pollutant in the water. The research investigated the changes in TP content during various hydrological phase under pollution incident, compared the duration and trends of TP concentration exceeding standard value before and after joint reservoir group dispatch. The results showed that the migration speed of TP pollutants varied from slowest to fastest in the following order: dry phase, recession phase, storage phase, and flood phase. Under pollution incident condition, the time demanded for TP content to meet standard value in each water phase was 36 min (dry phase), 33 min (recession phase), 30 min (storage phase), and 27 min (flood phase). The joint dispatch group 1–3 shortened the time required to meet standard value by 6–13 min (dry phase), 5–11 min (recession phase), 4–9 min (storage phase), and 3–7 min (flood phase). The trend of TP concentration before and after joint dispatch showed four stages: significant increase, sharp decrease, rapid decrease, and slow decrease. Joint dispatch of reservoir group can effectively reduced the TP concentration in DWSA under pollution incident.

中文翻译：

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水库组联合调度对饮用水源区水污染事件的影响


为减少饮用水源区 （DWSA） 水污染事件的危害并探索可行的方法，本研究基于二维水质和水量方程、地理信息系统 （GIS） 和数字高程模型 （DEM） 开发了 DWSA 水动力水质模型。以三峡库区和上山饮水源区（HDWSA）为研究区，以总磷（TP）为水中代表性污染物。研究调查了污染事件下各水文阶段 TP 含量的变化，比较了联合水库群调度前后 TP 浓度超标的持续时间和趋势。结果表明，青藏甘生物污染物的迁移速度从最慢到最快依次为：干期、衰退期、贮存期和洪水期。在污染事件条件下，每个水相 TP 含量达到标准值所需的时间为 36 min（干期）、33 min（消退期）、30 min（储存期）和 27 min（洪水期）。联合调度组 1-3 将达到标准值所需的时间缩短了 6-13 分钟（干燥期）、5-11 分钟（衰退期）、4-9 分钟（储存期）和 3-7 分钟（洪水期）。联合派遣前后 TP 浓度趋势呈现显著增加、急剧下降、快速下降和缓慢下降 4 个阶段。水库群联合调度可有效降低污染事件下DWSA中TP的浓度。