upstream inpoundment

例句：

1. 1. The river's upstream inpoundment is being studied for its potential impact on the ecosystem.
   河流的上游沉积物正在被研究，以评估其对生态系统的潜在影响。
2. 2. The study found that the upstream inpoundment was responsible for a significant portion of the water pollution.
   研究发现，上游沉积物是导致水污染的很大一部分原因。
3. 3. The upstream inpoundment has been identified as a major contributor to the acidification of the lake.
   已经确定了上游沉积物是导致湖泊酸化的主要因素。