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三峡水库启动新一轮生态调度试验

2018-05-19 19:56:04   新华网

新华社武汉5月19日电(记者 王自宸)三峡水库19日启动2018年促进“四大家鱼”繁殖产卵的生态调度试验,此举旨在制造“人造洪峰”,为“四大家鱼”产卵繁殖创造有利条件。

据了解,青鱼、草鱼、鲢鱼、鳙鱼等“四大家鱼”产卵繁殖需满足合适水温和合适涨水过程两个条件。目前,宜昌至监利江段水温已达到“四大家鱼”产卵合适水温20摄氏度左右,但由于三峡大坝蓄水使洪水节律有所改变,需要通过人为造成江水持续上涨过程,为繁殖期鱼群创造适宜产卵的水流条件。

根据气象水文部门预测,近期长江流域自西向东有一次强降雨过程,三峡水库将有一次明显涨水过程,水温和预报来水均满足生态调度试验条件。三峡水库按照长江防总调度指令于19日起正式启动促进“四大家鱼”繁殖产卵的生态调度试验。其中,19日三峡水库平均出库流量按照每秒14000立方米控制,20日起按照每日每秒1100立方米的增幅,逐日加大出库流量,持续到25日,持续涨水时间为6天。

在实施生态调度试验期间,有关单位将在宜都、枝江、沙市、监利等监测断面进行鱼类早期资源监测、繁殖群体监测和水文及环境要素监测。届时,将通过监测数据分析“四大家鱼”繁殖时间、繁殖地点、繁殖规模及产卵时水文条件等,评价生态调度效果。

据悉,自2011年以来,三峡水库已连续7年开展了10次生态调度试验,未来,三峡水库将结合来水条件及消落计划,单独或联合溪洛渡、向家坝水库继续择机开展生态调度试验。

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