摘要
本文依据１９５１～１９９１年实测的水文资料，全面估算了长江中游荆江南岸主要河流入湖径流量、输沙量；从多方面分析了径流泥沙的变化规律及其对当今洞庭湖所产生的一系列重大影响。
hrough the analysis of hydrological data measured form 1951 to 1991, it is shown that water and sand entering the Dongting Lake form main rivers rivers along the southern bank of the Jingjiang count 300. 2×109m3 and 191. 84×106t per year on average, respectively. The lardest monthly amounts of water and sand entering the lake occur from April to July. The ratio of the runoffs in high and low water years is 1. 88￣2. 78, while that of the sediment comes to 2. 96￣13. 5. After cutting off a crook of the Jinsjiang, the amounts of water and sand entering the lake from the four entrances shows a high-Water and low-water periodic cycle, and the period is about ten years, in agreement with that data of Datong Station in the Yangtze River. Floed water occurs more possibly from July to August. Any combination of flood-peak encounter Can Cause severe flood disaster in the Dongting Lake area. In flood season, the amount of water and sand entering the lake ig so large that 155. 1×106t of sediment accumulate on the lake bed each year, shrinking the area of water surface, and capacity and depth of the lake.
出处
《热带地理》
北大核心
1995年第4期313-320,共8页
Tropical Geography
关键词
洞庭湖
径流量
输沙量
湖泊
The Jingjiang River
The Dongting Lake
Runoff amount
Sediment discharge
