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太湖流域位于长江三角洲地区 ,其排涝过程受长江口海平面变化及潮位变化的控制。本文采用一维河网非恒定流理论 ,建立了太湖流域河网水文模型 ,并对 1 991年太湖流域洪涝过程进行的模拟。在此基础上 ,假定当太湖流域发生 1 991年特大暴雨过程时 ,海平面上升 0 .5m和长江口发生了百年一遇高潮位 ,太湖最高水位可分别达到 5.0 1m和 4.99m ,整个梅雨期排涝量分别比 1 991年少排 1 4.9× 1 0 8m3和 1 3.1× 1 0 8m3,加剧了该地区洪涝灾害的严峻程度。
The Taihu Lake Basin is located in the Yangtze River Delta. The drainage process is controlled by the sea level change and tide level changes in the Yangtze Estuary. In this paper, a one-dimensional river network unsteady flow theory is used to establish the hydrological model of the river network in Taihu Lake Basin and to simulate the flood in the Taihu Lake Basin in 1991. On the basis of this, assuming that when the extremely heavy rainfall process occurred in 1991 in the Taihu Lake Basin, the sea level will rise by 0.5m and the level of a century-long peak will occur in the Yangtze Estuary, and the maximum water level in the Taihu Lake will reach 5.01m and 4.99m respectively. Discharged less than 1 4.9 × 1 0 8m3 and 1 3.1 × 1 0 8m3 respectively in 1991, exacerbating the severity of flood and water disasters in the area.