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                        Optimization design and passability analysis of vertical slot fishway outlet for
                                     self-adapting to water level fluctuation in reservoir


                                 1                2             1             1          1            3



                   ZHENG Tiegang ，ZHANG Zhiguang ，SUN Shuangke ，LI Guangning ，LIU Haitao ，WEN Jingya


                 （1. Sate Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，China Institute of Water Resources and Hydropower






                      Research，Beijing  100038，China；2. PowerChina Beijing Engineering Corporation Limited，Beijing  100024，China；



                       3. Ministry of Ecology and Environment，Appraisal Center for Environment and Engineering，Beijing  100041，China）

                Abstract：Vertical slot fishways （VSFs）have been one of the popular fishway design types worldwide over the past

                30 years. The water depth at the exit section is one of the main factors affecting fish migration during VSF operation.

                To match the fluctuation of the water depth at the VSF exit section，an optimal VSF design method is proposed here.

                The  outlet  section  of  the  optimized  fishway  consists  of  three  parts：the  deep-water  section，overflow  section，and


                shallow-water section. Through physical model tests and numerical simulation calculations，the hydraulic characteris⁃

                tics of the outlet section of the fishway are studied in detail. The water depth and velocity profiles at the shallow sec⁃
                tion are uniform regardless of the water level at the VSF exit. Nevertheless，the hydrodynamic profiles at the deep-

                water section are non-uniform owing to the backwater effect，which decreases the velocity in the slot. Under different

                upstream water levels，the overflow section balanced the discharge between the inlet and outlet of the VSF through

                overflow，which basically satisfies the discharge relationship of a sharp-crested side weir. Although non-uniform con⁃


                ditions are present in the deep-water section，hydrodynamic profiles are suitable for migrating fish to pass through.
                This indicates that the optimized VSF is fish-friendly. The optimal VSF design method has major implications in real-

                life scenarios where uniform operating conditions are rarely achieved，particularly for daily regulation reservoirs.



                Keywords：vertical slot fishway；single exit section；fluctuation of water level；overflow section；hydraulics


                                                                             （责任编辑：鲁  婧  韩  昆）
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