一、试验材料 1.水域条件及面积.参试水域为二、三级河道,水面宽度50～110米,季节性水位变幅最大值80～100厘米,常年水深3～4.5米.正常情况下为单向水流,水流流速在0.065～0.15米/秒.河道中有客货船定线、定班航行和各种农副船只正常来往。河道沿岸系粮、棉、桑产区。试验区域水质良好,有害物质检出率低于渔业水质标准.试 First, the test materials 1. Water conditions and area. The test waters for the second and third grade river, the water width of 50 to 110 meters, the maximum seasonal amplitude of 80 to 100 cm, perennial water depth of 3 to 4.5 meters. Under normal circumstances For the unidirectional flow, water flow rate of 0.065 ~ 0.15 m / s. There are passenger and freight vessel routes in the river, scheduled flights and a variety of agricultural vessels normal traffic. River system is grain, cotton, mulberry area. Test area water quality is good, the detection rate of harmful substances lower than the fishery water quality standards