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Technical Note: Variability of Flow Discharge in Lateral Inflow-dominated Stream Channels : Volume 12, Issue 2 (25/02/2015)

By Chang, C.-m.

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Book Id: WPLBN0004012290
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Technical Note: Variability of Flow Discharge in Lateral Inflow-dominated Stream Channels : Volume 12, Issue 2 (25/02/2015)  
Author: Chang, C.-m.
Volume: Vol. 12, Issue 2
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Chang, C., & Yeh, H. (2015). Technical Note: Variability of Flow Discharge in Lateral Inflow-dominated Stream Channels : Volume 12, Issue 2 (25/02/2015). Retrieved from

Description: Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan. The influence of the temporal changes in lateral inflow rate on the discharge variability in stream channels is explored through the analysis of diffusion wave equation (the linearized St. Venant equations). To account for variability and uncertainty, the lateral inflow rate is regarded as a temporal random function. Based on the spectral representation theory, analytical expressions for the covariance function and evolutionary power spectral density of the random discharge perturbation process are derived to quantify variability in stream flow discharge induced by the temporal changes in lateral inflow rate. Upon evaluating the closed-form expressions, it is found that the variability in stream flow discharge increases with distance from the upstream boundary of the channel and time as well. The temporal correlation scale of inflow rate fluctuations plays a positive role in enhancing the variability of the flow discharge in channels. The treatment of the discharge variance gives us a quantitative estimate of uncertainty from the use of the deterministic model.

Technical Note: Variability of flow discharge in lateral inflow-dominated stream channels

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