artificial barriers data sheet.xlsx

Results of the assessment of fish passability through artificial barriers using Rapid Barrier Passability and Hydropower Assessment Tool (https://amber.international/software/). <br> As per this protocol, the parameters of the barriers measured included: DH – drop head, the height difference between the upper and lower water table (used interchangeably with barrier height); H – water depth at the crest of the barrier; Hf – water depth below the barrier; Wt – width of the barrier head; Df – height difference between the lower water table and lower part of an inclined weir; slope – tilt of barrier surface. Measured parameters refer to the state of the barrier in the moment of measurement. Almost all parameters would change under different flow conditions and if the position of movable part of the barrier was altered. <br> The ICE protocol determines passability class basing on a decision-tree scheme, with six steps of various thresholds values. When a threshold for a DH is passed, the decision tree goes to the next threshold about H, etc. There are 20 ICE species groups based on different fish species abilities. Passability class was therefore scored for 47 fish species in 20 groups. The fish passability score was divided into 4 classes: 0 – no fish of the species is able to pass the barrier, 0.33 – only the strongest fish in good condition can pass the barrier with this causing delays in migration, 0.66 – over half of the species population is able to pass the barrier, although it causes delays, 1 – most fishes of a given species are able to pass the barrier, although it still can cause a delay in migration.

基于快速屏障过鱼性与水电评估工具（Rapid Barrier Passability and Hydropower Assessment Tool，访问网址：https://amber.international/software/）开展的人工屏障鱼类过坝能力评估结果。
按照该评估规程的规定，本次实测的屏障参数包含：DH——落差水头（drop head），即上下游水位差（可与屏障高度互换使用）；H——屏障堰顶水深；Hf——屏障下游水深；Wt——屏障头部宽度；Df——下游水位与斜式堰下部之间的高差；slope——屏障表面倾斜度。所测得的参数均为测量时刻的屏障状态。在不同水流条件下，或屏障可动部件位置发生改变时，几乎所有参数均会发生变化。
ICE评估规程（ICE protocol）基于决策树逻辑框架确定鱼类过坝能力等级，共包含六个设置不同阈值的判断步骤。当满足DH阈值条件后，决策树将进入针对H的下一阈值判断环节，以此类推。该规程依据不同鱼类的生理通行能力划分了20个ICE物种类群，据此对20个类群下的47种鱼类开展过坝能力等级评分。鱼类过坝能力评分共分为4个等级：0级代表该物种无个体可通过该屏障；0.33级代表仅健康状态最佳的个体可通过该屏障，但会造成洄游延迟；0.66级代表该物种种群半数以上个体可通过该屏障，但仍会造成洄游延迟；1级代表该物种绝大多数个体可通过该屏障，不过依旧可能引发洄游延误。