标题:
三峡工程运行初期洞庭湖洲滩变化及成因分析Changes of Beach and Genetic Analysis in the Dongting Lake Wetland during the Initial Running of the Three Gorges Project
作者:
周柏林, 谢石, 肖义, 刘晓群, 梁婕, 曾光明, 杜春艳
关键字:
MODIS, 洞庭湖, 洲滩, 三峡工程MODIS Data, Dongting Lake, Beach Wetlands, The Three Gorges Project
期刊名称:
《Journal of Water Resources Research》, Vol.4 No.1, 2015-02-04
摘要:
利用MODIS影像数据集提取了2000~2010年间的洞庭湖洲滩面积，结合城陵矶水位的实测数据，分析了三峡工程运行初期城陵矶24~28 m水位下洞庭湖洲滩面积和出露时间的变化规律。结果表明，三峡工程运行后，24 m、25 m、26 m、27 m和28 m水位下洞庭湖洲滩面积分别增加71.0 km2、87.7 km2、103.5 km2、118.5 km2、132.5 km2；洞庭湖洲滩出露时间分别延长19 d、27 d、25 d、11 d和8 d。这种变化是三口、四水来水减少、降雨减少等多方因素共同作用的结果，而三峡在9月~10月间蓄水，将进一步加重洞庭湖洲滩裸露的趋势。
Data sets of beach wetlands area in the Dongting Lake were extracted using MODIS imagery from 2000 to 2010. The data sets were compared with the observed water-level of the Chenglingji. And the changes of beach wetlands area and their emergence time were analyzed. The results indicated that after the initial running of the Three Gorges Project, the beach wetlands area of the Dongting Lake increased 71.0 km2, 87.7 km2, 103.5 km2, 118.5 km2, 132.5 km2 at the Chenglingji water level of 24 m, 25 m, 26 m, 27 m and 28 m respectively. And the emergence time of the beach wetlands prolonged 19 d, 27 d, 25 d, 11 d and 8 d, respectively. In conclusion, it is resulted from multi-factors, including reduction of runoff from the Three Channels (Songzi, Ouhe, Taiping) and the Four Branches (Xiang River, Zi River, Yuan River and Li River), reduction of rainfall, etc., which contributed to the reduction of beach wetlands area and prolonging their emergence time of the Dongting Lake. The impoundment of the Three Gorges Project from September to October would further aggravate the emergence trend of beach wetlands.