The Demonstration About Size Of Flood Control Storage In DaTeng-gorge Hydro-junction

Through the flowing datum: formation-cause of rainstorm , flood-specificity, the hydrographic-net of watershed, the coefficient of confluence of river-course and so on of BeiJiang river-basin, the text analyzed the formation-cause of flood; checked the design-flood of control station which is in the trunk stream and great branch of XiJiang. calculated the related design-flood and the flood which is in the dam site of the hydro-junction engineering of DaPeng-gorge, analyzed the influence to design flood of great control station which in the trunk stream when the flood joined: investigated and collected the society-economy formations which are in the influenced-region of reservoir flood and the sheltered-region of flood-control at low-reach, estimated the important social economic index of different lever year; studied out the flood-control task of hydro-junction of DaTeng-gorge by the flood-control standard which was ensured through flood-control programming of ZhuJiang-river basin; after synthetically analyzing the status and effect of flood control of the reservoirs which are the built-reservoir or building-reservoir of the trunk stream and tributary stream, researched flood-control manner, ascertained the flood-control-storage of reservoir and the characteristic river-stage of flood-control, calculated fruits of redistributed-flood at different flood-control-storage schemes; computed the temporary flooding-range of zone which was protected by the reservoir the primary index of flooding-losses and the correspond benefit of flood-control in the sheltered-region of low reach, and computed the benefit of flood-control under different flood-control-storage scheme of DaTeng-gorge reservoir; by comparing the technique-economy index of different flood-control-storage scheme, recommended the economic and reasonable size of flood-control-storage.Basing on the recommended size of flood-control-storage, the text analyzed the influence to the flooding of extra storage when the reservoir was setup different limited-river-stage in flood-season, the effect of flood-control when the reservoir was temporarily reduced river-stage in flood-season, the effect of flood-control when the reservoirs in the branch were applied. the influence to minimum storage at different safety rate of runfall of controlled-station. sufficiently demonstrated the flood-control-storage and limited river-stage in flood-season which DaTeng-gorge reservoir should be setup.