A STUDY ON THE FLOOD STORAGE CAPACITY IN DONGTING LAKE

1 INTRODUCTION Dongting Lake lies south of the middle reach of the Yangtze River in Hunan and Hubei provinces (Fig. 1). On the north side of Dongting Lake, there are the three diversion openings of the Yangtze River named Songzi, Taiping, and Ouchi, and, on the south and west sides, there are the four tributary streams named Xiang, Zi, Yuan, and Li Rivers. The flow of the three diversion openings and the four tributary streams runs into Dongting Lake, and runs out at Chenglingji a…

A STUDY ON THE FLOOD STORAGE CAPACITY IN DONGTING LAKE

Using field data from the 1950's to 1990's, the flood storage capacity of Dongting Lake was analyzed.The impacts of sediment deposition in Dongting Lake and in the reach of the Yangtze River from Chenglingji to Hankou were analyzed. The effects of land reclamation in the lake region on the flood storage capacity also were analyzed on annual and other time scales. The study shows that sediment deposition in the downstream reach is the main reason of flood storage increases under the same inflow condition.