三维水动力学数值模拟获得中华鲟偏好流速曲线

偏好流速是描述鱼类行为的重要特征量,是建立鱼类行为与栖息地水力特性关系的桥梁。中华鲟是我国重要的珍惜鱼类,由于其体形庞大,在实验室获得其偏好流速非常困难。同时由于其底栖性,在自然界中获得其活动位置附近微栖息地的流速特征也非常困难。自从葛洲坝1981年大江截流后,原本洄游到上游进行繁殖的中华鲟被阻隔在葛洲坝以下,并在葛洲坝下狭小的水域中进行自然繁殖。本文使用三维数值模拟方法模拟此河段的流场特征,并结合1998年到2002年间在此河段进行的声纳探测结果获得中华鲟的偏好流速。

Chinese sturgeon (Acipensor sinensis) preference velocities from river simulation

Preference velocity is an important character of fish behave which is a bridge to connect the fish behave and the habitat.It is difficult to gain micro-habitat character such as velocity around the fish since Chinese sturgeon,Acipensor sinensis,is a kind of large-scale fish.Since main channel closed for the construction of the Gezhouba Dam in 1981,upstream migration of Chinese sturgeon,for natural propagation in upper reaches of the Yangtze River has been blocked.Fortunately,the fish found an alternative spawning ground located in a narrow reach downstream close to the Gezhouba Dam site,and perform natural propagation annually.In this paper authors employed computational fluid dynamics(CFD) software Delft3D simulate this reach.Chinese sturgeon was detected with acoustic detector at the spawning ground from September to November since 1998 to 2002 by Tan.With the digital model and the positions detected by Tan of Chinese sturgeon,authors developed a method to gain the preference velocity rang of the fish.