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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。
Three Gorges Project storage process has changed the status of downstream water may affect the downstream water and salt dynamics. During the impoundment process of typical dry years in 2006, the dynamics of water and salt in the estuary may be influenced by the upper reaches of the impoundment. During the impoundment of the Three Gorges Reservoir in the autumn of 2006, the reduction of runoff in the Yangtze River caused by water storage was about 4 000 m 3 / s, a drop of 33% compared with the lowest runoff. Using the monitoring data analysis, the time series of the runoff before the impoundment in the Yangtze River estuary before the impoundment in 2006 was searched, and the dynamic changes of the water and salt elements in the Changjiang estuary area under the condition of similar runoff before and after the impoundment were studied and analyzed. The results showed that there was a significant difference in the salinity of river water, groundwater and soil before and after water storage. The water content of river water, groundwater and soil before the impoundment in 2006 and its subsequent impact period were all higher than those before water impoundment, The highest increase of salt concentration in the Houjiang River is about 45%, while the increase of soil salt content is about 10%. Under the premise of natural runoff before and after water storage, the reduction of runoff caused by regulation of the Three Gorges Project may be an important reason for the increase of salinity, groundwater salinity and soil salinity, indicating that the Three Gorges Reservoir has a great influence on the dynamics of water and salinity elements Changes have a certain impact.