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1990年8月,沂沭河的暴雨洪水造成“小洪水、高水位、大抗洪”究其原因,主要有:①挡潮坝未能在洪水上滩前拆除,待洪水上滩后拆除困难。去年行洪时,4.5公里长的挡潮坝只炸除几处,总长约70米,严重阻水;②挡潮坝以下到海口3～5公里处,平均河宽3.1公里,近2万亩滩地芦苇丛生,阻水严重;③海口淤积严重,新沂河的五道泓子严重淤塞,挡潮坝以下的滩地平均淤高约0.9米;④行洪时正值大潮(1990年8月7日燕尾港潮位3.21米),河水入海被顶托。新沂河挡潮坝的设计水位6000立方米每秒时为4.7米,堤顶高程7.7米,去年行洪4890立方米每秒时水位高达5.86米,距堤顶只有1.84米。如遇10级大风,风浪高达2.3米,行洪6000
In August 1990, the causes of “small floods, high water levels and great flood resistance” caused by storm floods in the Yishu River were mainly as follows: ① The tide dam failed to be dismantled in front of the flood and was difficult to dismantle after the beach was flooded. During the flood passage last year, the 4.5-kilometer-long tide dam was only blown away by several places, with a total length of about 70 meters and a serious water blockage. The tidal flats below were 3 to 5 kilometers away from the sea mouth, with an average river width of 3.1 kilometers and nearly 20,000 mu The reeds in the floodplain are flooded and the water blocking is serious; ③ The siltation in the seaport is serious, and the silt of Wudaohong in Xinyi River is seriously blocked; the average silt of the beach under the tide dam is about 0.9m; ④ The tide during the flood (August 7, 1990 Dove Diversion tide 3.21 meters), the river into the sea is the top support. Xinyi tide dam design water level of 6000 cubic meters per second when the 4.7 meters, embankment elevation of 7.7 meters last year, flood 4890 cubic meters per second when the water level up to 5.86 meters, only 1.84 meters from the top of the dike. In case of 10 gale, storm up to 2.3 meters, flood 6000