THE BASIC CHARACTERISTICS OF THE BEACH RESOURCES OF THE THREE BIG LAKES IN THE MIDDLE-LOWER YANGTZE RIVER REGION AND THEIR EXPLOITATION AND UTILIZATION
长江中下游三大湖泊滩地资源的基本特征及其开发利用

The Dongting, Poyang and Taihu Lakes are the three big lakes in the middle-lower Yangtze River region. The sediment has been depositing in these lakes for a long time, with the result that the beaches of different sizes have been formed. The beach area of the Poyang Lake is the biggest, that of the Dongting Lake is the second, and that of the Taihu Lake is the Smallest. Their total area amounts to 5.272 square kilometres. The development degree of the beach is closely related to the input amount of the sediment entering the lakes, the change range of water level, and the reclamation by the human race. The development degree of the vegetation corresponds with that of the beaches. As to the regimen of the beaches of these lakes, there is always a seasonal change. The frequency and the lasting period of the beach exposure depend upon the beach hight, but the annual change ratio differs greatly from year to year.It is necessary to make a comprehensive plan for the exploitation and utilization of the beach resources of the three lakes.