浅析灌江纳苗对天鹅洲湿地水质及泥沙的影响

Analysis of effect of a doption of fries by filling with river flows on water quality and sediment of Tianezhou wetland

长江天鹅洲故道湿地是我国重要的淡水湿地类型之一,目前正处于由河道型湿地转向湖泊型湿地的过程之中.由于长江大堤的阻隔,故道与长江的水沙交换受到限制,引起一系列的水沙条件变化.对天鹅洲故道水域及天鹅洲闸前与长江相连的盲肠河段灌江纳苗前后水质、河道泥沙等进行了取样分析,实测资料分析显示:灌江纳苗后盲肠河段及故道pH值、总含盐量较灌江纳苗前有所降低;碱度、HCO3-、Cl-浓度变化不大;总硬度、Ca2+浓度稍微加大.且灌江纳苗在引入长江水的同时,也引入了部分泥沙并沉积在闸前盲肠河段及故道中.

The Tianezhou ancient course wetland is one of the important freshwater wetland in China. It is changing from river wetland to lake wetland at present. Because of obstructing by the Yangtze River Dike, the exchange of water and sediment between the ancient course and Yangtze River are limited, leading the water and sediment having much changes. Before and after adoption of fries by filling with river flows, the water quality and sediment of the ancient course and the cecum reach that connect the Tianezhou gate and the Yangtze River are analyzed. The result shows that pH and total salinity have decreased; the alkalinity and concentration of HCO3^- and Cl^- have little changed; the total hardness and concentration of Ca^2＋ have increased in the cecum reach and the ancient course after adopting fries by filling with river flows. When adoption of fries by filling with river flows, sediment is adopted and sedimentated in the cecum reach and the ancient course at the same time of indraught water.