Modeling Fish Movement Trajectories in Relation to Hydraulic Response Relationships in an Experimental Fishway

Junjun Tan,Lin Tao,Huichao Dai,Xiaotao Shi,Zhu Gao

doi:10.3390/w10111511

Abstract

This study developed an IBM (individual-based model) to model fish movement trajectories integrating hydraulic stimulus variables (turbulent kinetic energy (TKE), velocity (V) and strain rate (SR)) to which fish responded, and the rules for individual fish movement. The fish movement trajectories of the target fish, silver carp (Hypophthalmichthys molitrix), were applied to model fish trajectories in a 1% vertical slot fishway at a discharge of 13.5 L/s. Agreement between measured and simulated trajectories implied the plausibility of the movement rules, which illustrated that the fish movement trajectories model has the preliminary ability to track individual fish trajectories for this fishway.

Highlights

The construction and operation of dams have blocked the migration routes of fish and divided river ecosystems into discontinuous ones, resulting in dramatic declines in the abundance of freshwater fish, especially those that complete their migrations within river systems [1,2,3]
The property differences were represented by the length, and the action difference was represented by the movement and response to the hydraulic conditions [21]
Some of the parameters involved in the present modeling are uncertain or even completely unknown, the simulated and measured trajectories preliminary implied the plausibility of the model movement rules

Summary

Introduction

The construction and operation of dams have blocked the migration routes of fish and divided river ecosystems into discontinuous ones, resulting in dramatic declines in the abundance of freshwater fish, especially those that complete their migrations within river systems [1,2,3]. It is important to track the movement behavior of target fish considering the hydraulic conditions within a fishway [11,12,13], which remains a key factor in the design of mitigation technology. It seems that it was important for fish finding the conditions along the trajectories. Due to the high cost and long period of monitoring processes, numerical simulations based on the physical mechanisms of fish has become one of the important methods to judge fishway designs

Objectives

Methods

Results

Discussion

Conclusion