Analysis and prediction of sediment trapping efficiencies of the reservoirs in the mainstream of the Lancang River

存储的水和水库套住的沉积在下游的水路环境上导致物理、化学、生态的效果。关于水库沉积的量的研究是钥匙估计它的环境影响。在位于 Manwan 水库的 upstream 和 downstream 的计量车站在 39 年获得的沉积负担数据被用来估计 Manwan 水坝的套住的效率(TE ) 。TE 价值当时与用修改 Brune 和 Siyam 模型的估计相比。结果显示那：(1 ) 计量数据估计的 Manwan 水坝的 TE 是 60.48% ，并且两个都， TE 值由修改 Brune 计算了， Siyam 模型是 60.03% 。近似 TE 价值显示修改 Brune 和 Siyam 模型能被用来在 Lancang 河的主流作为 Manwan 水库与类似的存储能力预报另外的水库的 TE；(2 ) Gongguoqiao， Dachaoshan 和 Jinghong 水坝的 TE 价值是大约 30.23% ， 66.05% 和 63.50% 由修改 Brune 模型估计了，并且 38.81% ， 63.97% 和 62.30% 由修改 Siyam 当模特儿。在论文采用的结果和方法论能也被用来在西南的中国在另外的河盆估计 TE。

The water stored and sediment trapped by the reservoirs result in physical, chemical and ecological effects on downstream watercourse environment. Quantitative research on the reservoir sedimentation is the key to assess its environment impacts. The sediment load data obtained over 39 years at the gauging stations located in the upstream and downstream of the Manwan Reservoir were used to estimate the trapping efficiency （TE） of the Manwan Dam. The TE value was then compared with the estimates using the modified Brune and Siyam models. The results indicate that： （1） The TE of the Manwan Dam estimated by the gauging data was 60.48%, and both the TE values calculated by the modified Brune and Siyam models were 60.03%. The approximate TE values indicated that the modified Brune and Siyam models could be used to forecast the TEs of other reservoirs with similar storage capacities as the Manwan Reservoir in the mainstream of the Lancang River; （2） The TE values of Gongguoqiao, Dachaoshan and Jinghong Dams were about 30.23%, 66.05% and 63.50% estimated by the modified Brune model, and 38.81%, 63.97% and 62.30% by the modified Siyam model. The results and the methodologies adopted in the paper could also be used to estimate the TE in other river basins in southwestern China.