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Dissertation/Thesis Abstract

Impact of Flow Diversion and Temperature on Chinook Salmon Habitat in Lemhi River, ID, USA
by Adhikari, Nirajan, M.S., Southern Illinois University at Edwardsville, 2019, 90; 22592237
Abstract (Summary)

Diversion of water from the stream changes the river physical processes and ecological integrity. Diversion from the stream mainly for irrigation from the Lemhi River, historically good habitat for Chinook salmon were affected. The study focused on quantifying impacts of water diversion on the juvenile and spawning life stages of Chinook salmon. The average flows of normal (October) and diverted (August) flow were considered for the study.

Firstly, spatially distributed 2D hydrodynamic model was developed to simulate water depth, velocity, and temperature using MIKE21software. The heat exchange module was used for water temperature modeling. These simulated physical parameters (water depth, velocity, and temperature) and habitat preference curves were used to develop a habitat model to simulate habitat quality. The study results showed water temperature varies longitudinally and laterally in a stream. Furthermore, Chinook salmon habitat was altered due to flow diversion and change in water temperature, which is a result of a change in seasonal atmospheric temperature. The normal flow during October with low water temperature was found favorable for spawning life stage compared to the diverted flow during in August with high water temperature. Nevertheless, Juvenile habitat was not distinctly altered in our study as a result of the change in flow and water temperature. One of the novelties of this study is the application of 2D temperature model to simulate spatially distributed water temperature as a function of metrological drivers, which is an important parameter for salmonid habitat. The study provides insight to water managers to manage and restore salmonid habitat, which is sensitive to water temperature and streamflow changes.

Indexing (document details)
Advisor: Benjankar, Rohan
Commitee: Fries, Ryan, Qi, Yan
School: Southern Illinois University at Edwardsville
Department: Civil Engineering
School Location: United States -- Illinois
Source: MAI 81/3(E), Masters Abstracts International
Subjects: Civil engineering
Keywords: 2D modeling, Aquatic habitat analysis, Chinook salmon, Hydrodynamic modeling, MIKE21, Temperature modeling
Publication Number: 22592237
ISBN: 9781088374603
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