中文摘要：

以镇江内湖2004年4月21—22日、2004年8月18—19日两次野外大规模水文、水质及泥沙同步监测资料为基础,针对内湖与长江相通、潮汐作用明显的特征,对内湖水位、库容、流量、流速的基本变化规律,水质、泥沙的时空分布特征进行了系统研究。结果表明：内湖水面面积与库容随潮位变化较大,枯季内湖最大潮差比洪季高0.39m;内湖流速的变化主要取决于潮汐影响强度,进出断面一般在低潮位后出现最大流速,在高潮位后出现最小值;洪季内湖水质明显优于枯季,涨潮过程水质浓度下降,退潮浓度上升;洪季内湖水体含沙量及全潮泥沙淤积总量大于枯季,但洪季水流的挟沙能力较强,泥沙淤积量占全潮总来沙量的百分比（27.8%）小于枯季（50%）。

英文摘要：

Ab Based on a large scale comprehensive hydrological and water-quality monitoring data of the Inner Lake in Zhenjiang city, Jiangsul from April 21st to 22nd and from August 18th to 19th in 2004, the authors of this paper have done a systematic observation and recording of the basic changing regularities of the water level, storage capacity, flow quantity and velocity of the Lake in accordance with the tidal changes of the lower-reach of the Yangtze. At the same time, the time-space distribution characteristics of the water quality and sediment concentration as well as the tide impacts on these features were carefully analyzed. The balances between the inflow and outflow quantity of water and sediments in dry seasons and flood seasons were also calculated and studied. The results of our observations and investigations prove that the surface area and storage capacity of the lake change greatly with water level when the water level increase from lm to 3 m, with the surface level increased from 2.85 km^2 to 6.0 km^2. The maximum gap of water level in dry season was 1.55 m, which was 0.39 m higher than that in the flood season. The water quality in flood season was remarkably better than that in the dry season, and the quality concentration decreased during spring tide and increased during ebb tide in both flood and dry season. The concentration of sediments and the amount of accumulated sediments of the Inner Lake in flood season were much greater than that in dry seasons, but as a result of great carrying capability of water current in flood season, only 27.8 % of the sediment brought into the inner lake could be accumulated, which was thus lower than the 50% in dry season. The conclnsions of this paper would be useful to keep the balance among water quantity, water quality and sediment accumulation in the Inner Lake and would provide important gists for making efi%ient measures to solve the present water environmental problems of the lake.