Distribution of Characteristic Confluence Ratio Aquatic Index in the Confluence Area of Yangtze River and Jialing River
A three-dimensional flow mathematical model was used to analyze the distribution characteristics of hydraulic habitat indicators under the characteristic confluence ratio of the Yangtze River and the Jialing River.The results show that:1 The characteristics of water level changes along the fish growth period and the breeding period are similar.The water body at the intersection is squeezed to produce backwater,and the downstream channel of the intersection forms a recirculation zone.After the fluid is separated from the intersection area,it is affected by the outer beam of the left bank side,and the fluid is compressed to the right bank to form a high-speed mainstream area.The overall flow rate of the study area shows a trend of low left and high right.The suitable habitat of fish was evenly distributed in the middle and lower layers of the deep channel before the intersection,and the distribution area increased with the increase of flow rate.After the confluence,the suitable habitat for fish is mainly distributed in the middle and lower layers of the main stream deep channel water body and the right side beach.As the flow increases,the suitable area shifts to the riverbed and the right side beach.
Intersection areacharacteristic confluence ratiohydraulic characteristicsfish hydraulic habitat index
万方数据
维普
