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一、波阳湖洪水与长江密切相关长江干流自宜昌至武穴为中游,波阳湖出口在武穴以下82公里,两岸大部分为堤防,汛期基本上无支流汇入。湖口水位20米(吴淞标高,下同)以上时,湖面近于水平,康山距湖口一百多公里,高水期两站水位差仅在正负0.2米以内,故沿湖洪水位与湖口息息相关。波阳湖集水面积16.2万平方公里,为长江的9％。湖口水位主要依长江流量之大小而涨落,与湖内本身流量无关(见表1),故研究波阳湖的防洪问题,必须了解长江的水情。
First, the Bo Yang Lake flood and the Yangtze River is closely related to the Yangtze River from Yichang to Wuxue as the middle reaches of the Yangtze River, Bo Yang Lake exit 82 km below the Wuxue, most of the two banks for the embankment, flood basically no tributary. Lake level 20 meters (Wusong elevation, the same below), the lake is near the level of Kangshan away from the Hukou more than 100 kilometers, high water two stations only within plus or minus 0.2 meters, so the lake flood level Hukou is closely related. Bo Yang Lake catchment area 162,000 square kilometers, 9% of the Yangtze River. The water level in Hukou mainly fluctuates according to the flow of the Yangtze River, which has nothing to do with the flow in the lake itself (see Table 1). Therefore, it is necessary to understand the flood control of the Yangtze River in order to study the flood control problems of the Boyang Lake.