中文摘要：

三峡工程调蓄进程改变了下游的来水状况,可能影响下游的水盐动态。挑选蓄水进程中典型枯水年2006年蓄水进程时段,分析该时段河口水盐动态可能受上游蓄水的影响程度。2006年秋季三峡水库蓄水期间,蓄水导致长江径流减少量约为4 000m3/s,与径流量最低值相比下降幅度达33%。运用监测数据分析搜索了蓄水之前与2006年秋季蓄水时段长江大通径流量相似的时间序列,研究并分析了蓄水前后相似径流量过程情况下长江河口区域水盐要素动态变化情况。结果表明：蓄水前后的江水、地下水及土壤盐分状况存在较为明显的差异,2006年蓄水阶段及其后续影响时段的江水、地下水及土壤盐分含量均大于蓄水前各要素测值,蓄水后江水盐分最高增加幅度约为45%,而土壤盐分含量增加约为10%。在蓄水前后自然径流量过程基本相似的前提下,三峡工程调蓄所致的径流量减少可能为江水盐分、地下水盐分及土壤盐分上升的重要原因,表明三峡调蓄对河口水盐要素的动态变化存在一定影响。

英文摘要：

The Three Gorges Dam（TGD） changes the water source of estuary area,which may influence the dynamics of water-salt in estuary areas.We analyzed the possible impact of the 2006 water storing process to the downstream areas.Water storing decreased about 4 000 m3/s of the flow in the Yangtze River.Compared with the lowest runoff,water flow dropped about 33.3%.Taking the flow loss into consideration,we found a runoff time series that is similar to storing period in 2006.The Yangtze River water,groundwater and soil salt content in 2006 were greater than those during similar time series,and the Yangtze River water EC and soil salinity increased about 45% and 10% respectively.Decline in water flow influences the dynamics of all the water-salt element in a certain extent,that is to say,the TGD can be estimated as an important factor in the process that influenced the water-salt change in the estuary region.