Research On The Relation Between Operation Regulation And Sediment Deposition Of Reservoir

Reservoir plays an important role in the national economic development. Building reservoir is an effective means to change the temporal and spatial asymmetry of the distributing of the water resource, building reservoir is also an important part of the system to reduce flood and develop the water resource. The benefit of the reservoir is developed through the reservoir operation, and the operation regulation has a consanguineous relation with the deposition development, distributing and the silt-stable in reservoir.In this paper, based on data analysis and calculating, the character of deposition development and the silt-stable in reservoir is researched, and the influence on deposition development and silt-stable lead by the operation regulation of reservoir is researched farther. The analysis of water and sediment, deposition process, and substaintial mechanism is lay particular stress on. Besides these, the operation regulation of the Three Gorges Reservoir is optimized. The main production is listed.1. Through analyzing the deposition development and the silt-stable of reservoir, a conclusion is that the silt-stable is kept with the erosion in flood period and deposition in low-water period under the regulation of storing clear water and discharging muddy water. After the silt-stable is get, the change of longitudinal profile is decided by the transport capacity of the flood period to discharge the muddy in this period and the deposition in high water level period.2. Based on sediment mathematical model, the deposition development of the Three Gorges Reservoir and the influence of the characteristic water level on the sediment deposition in the reservoir are researched. With certain incoming flow and sand, reasonably changing the duration of flood control water level and reasonably changing the normal water level before flood period or after flood period will increase the deposition in storage period and increase the press to discharge muddy water, if the increased deposition doesn't exceed the affluent transport capacity, the silt-stable will not change. Whether the duration of flood control water level changes the silt stable is decided by the increased deposition is discharged in the effective erosion period. If the increased deposition can't be discharged in the effective erosion period, the silt-stable will change. 3. The benefit and the effect on sediment deposition brought by optimizing the operation regulation of the Three Gorges Reservoir is researched, a conclusion is drawn that reasonably reducing the duration of flood control water level can increase the electric power benefit without affecting flood control, besides, this will not change the silt-stable and the navigation loss can be compensated by the benefit with engineering measure.4. The erosion and deposition in Chongqing Reach are calculates and analyzed in different optimizing operation regulations, and the effect of the reservoir built upriver and the regulation works is considered, the influence on the erosion and deposition in local reach brought by the change of operation regulation is researched farther. It indicated that optimizing operation regulations not change the distributing and the silt-stable only quicken the deposition development. the reservoir built upriver and the regulation works put in practice will benefit to put the optimized operation regulation into practice.