编号
zgly0001584776
文献类型
期刊论文
文献题名
三峡水库运行下洞庭湖盆冲淤过程响应(英文)
作者单位
CollegeofResourcesandEnvironmentalSciences
HunanNormalUniversity
NanjingInstituteofGeographyandLimnology
CAS
UniversityofChineseAcademyofSciences
HunanHydro&PowerDesignInstitute
母体文献
Journal of Geographical Sciences
年卷期
2015年08期
年份
2015
分类号
TV697
TV14
关键词
TheThreeOutlets
TheThreeGorgesReservoir(TGR)
flowrate
sedimentdeliveryrate
DongtingLake
文摘内容
Based on field-survey hydrological series in the Dongting Lake watershed from 1951 to 2011, the variations of lakebed sediment siltation/erosion(S/E) regimes of the Dongting Lake after the operation of the Three Gorges Reservoir(TGR) were analyzed. Significantly positive correlations were found between the flow rate from Zhicheng and the Three Outlets(r2=0.859, p<0.0001), and between the flow rate and sediment delivery rate at the Three Outlets(r2=0.895, p<0.0001). This indicated that the flow rate and sediment delivery rate at the Three Outlets were largely determined by the flow rate from the upstream Yangtze River. Sediment deposition amount in the Dongting Lake basin dropped from +4796.4×104 t during the period before the operation of TGR(1999–2002) to +684.1×104 t, +449.8×104 t and –559.6×104 t during the impoundment Phases I, II and III of TGR. The S/E regimes changed from a siltation-dominant to an erosion-dominant state under the pre-discharge, water-storage and water-supplement dispatch over the impoundment from Phase I to III. The sediment deposition amount decreased dramatically under the flood-storage dispatch over the impoundment Phase I to III. The estimated annual mean flow rate, sediment delivery rate and sediment concentration thresholds were respectively 970.81 m3/s, 466.82 kg/s and 0.481 kg/m3 for the upstream Three Outlets to maintain an erosion-dominant state in the downstream linked the Dongting Lake.