IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 33rd Congress - Vancouver (2009) : Topic C: Water Engineering for the Protection and Enhancement of Natural Watershed/Aquifer Environme... : Assessment of exhaustion-threshold curves for fish volitionally swimming in culverts
Assessment of exhaustion-threshold curves for fish volitionally swimming in culverts
Author : James A. Harvey, Vincent S. Neary, Hayden Mattingly
The predictive performance of exhaustion-threshold (ET) curves was examined for western mosquitofish (Gambusia affinis) and the Barrens topminnow (Fundulus julisia) under volitional swimming conditions for three culvert flow regimes. The ET curves were previously developed using standard protocols based on fixed velocity swimming endurance tests. As plots of mean flow velocity versus passage-barrier length, these curves ideally predict the threshold condition for passage of a given species in a culvert. The culvert is assumed to be a barrier to fish passage when ordinates, based on these parameters, fall above the ET curve and to allow passage when ordinates fall below the curve. In this study passage was reported for both species. Sixteen trials for each species were conducted and passage was monitored for 240 topminnows (29.0-89.8 mm total
length) and 238 mosquitofish (31.7-56.9 mm total length). Three outlet control culvert flow regimes were considered: a fully pressurized pipe flow, a drawdown (M2) flow profile, and a backwater (M1) flow profile. For all three culvert flow regimes, the mosquitofish ET curves successfully predicted passage and exclusion for 93.4% and 90.0% of the fish, respectively. For the pressurized and drawdown flows, the ET curves successfully predicted exclusion for 91.7% and 78.3% of the fish, respectively. For the backwater flow, they successfully predicted outright (100%) exclusion. For all three culvert flow regimes, the topminnow ET curves successfully predicted passage for 71.7% of the fish. Successful passage was predicted for 65.2%, 73.2%, and 77.1% of the fish for the pressurized, drawdown, and backwater flow, respectively. This study suggests that ET curves can provide reasonable predictions of fish passage despite differences between fixed and volitional swimming conditions and the common disregard for spatially non-uniform local flow conditions. It supports the application of ET curves as passage screens in regional culvert assessments for the species tested.
File Size : 103,961 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 33rd Congress - Vancouver (2009)
Article : Topic C: Water Engineering for the Protection and Enhancement of Natural Watershed/Aquifer Environments
Date Published : 09/08/2009
Download Now