構造沉降和泥沙淤積對洞庭湖區(qū)防洪的影響

Abstract： With the long-term data of the geodetic sea level measurements undertaken in the Dongting Basin and the recent sediment data of Dongting Lake, we analyze the tectonic subsidence rate of the Dongting Basin and the sedimentary rate of Dongting Lake. From the point of view of geomorphology and hydrogeology, we distinguish the two different spatial concepts between "the basin of Dongting Lake" and "the Dongting Basin". Then, we discuss the influences of the tectonic subsidence and the siltation on the levees and the space of storing flood. The better quality of levees is required due to the tectonic subsidence and the siltation, and the difficulties of preventing flood disasters are increasing.The space of storing flood is not affected by the tectonic subsidence, but by the siltation. At present,the sedimentary rate of Dongting Lake is higher than the tectonic subsidence rate of the Dongting Basin. The tectonic subsidence capacity of the Dongting Basin counteracts a part of sedimentary capacity, and the shrinking tendency of Dongting Lake is restrained to a certain extent, but the tectonic subsidence is harmful to the situation of preventing flood disasters in the Dongting Lake area. 作 者： 來紅州    莫多聞   作者單位： College of Environmental Sciences, Peking University, Beijing 100871, China  期 刊： 地理學報(英文版)  ISTICSCI   Journal： JOURNAL OF GEOGRAPHICAL SCIENCES  年，卷(期)： 2004, 14(2)  分類號：   Keywords： Dongting Lake    tectonic subsidence    siltation    flood disasters   

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