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Title: Nonlinear Filtering Effects of Reservoirs on Flood Frequency Curves at the Regional Scale: RESERVOIRS FILTER FLOOD FREQUENCY CURVES

Abstract

Anthropogenic activities, e.g., reservoir operation, may alter the characteristics of Flood Frequency Curve (FFC) and challenge the basic assumption of stationarity used in flood frequency analysis. This paper presents a combined data-modeling analysis of the nonlinear filtering effects of reservoirs on the FFCs over the contiguous United States. A dimensionless Reservoir Impact Index (RII), defined as the total upstream reservoir storage capacity normalized by the annual streamflow volume, is used to quantify reservoir regulation effects. Analyses are performed for 388 river stations with an average record length of 50 years. The first two moments of the FFC, mean annual maximum flood (MAF) and coefficient of variations (CV), are calculated for the pre- and post-dam periods and compared to elucidate the reservoir regulation effects as a function of RII. It is found that MAF generally decreases with increasing RII but stabilizes when RII exceeds a threshold value, and CV increases with RII until a threshold value beyond which CV decreases with RII. The processes underlying the nonlinear threshold behavior of MAF and CV are investigated using three reservoir models with different levels of complexity. All models capture the non-linear relationships of MAF and CV with RII, suggesting that the basic floodmore » control function of reservoirs is key to the non-linear relationships. The relative roles of reservoir storage capacity, operation objectives, available storage prior to a flood event, and reservoir inflow pattern are systematically investigated. Our findings may help improve flood-risk assessment and mitigation in regulated river systems at the regional scale.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [6];  [3]; ORCiD logo [7];  [8]
  1. Ministry of Education Key Laboratory for Earth System Modeling, and Department of Earth System Science, Tsinghua University, Beijing China; Pacific Northwest National Laboratory, Richland WA USA
  2. Pacific Northwest National Laboratory, Richland WA USA; Department of Land Resources and Environmental Sciences & Institute on Ecosystems, Montana State University, Bozeman MT USA
  3. Pacific Northwest National Laboratory, Richland WA USA
  4. Department of Land Resources and Environmental Sciences & Institute on Ecosystems, Montana State University, Bozeman MT USA
  5. State Key Laboratory of Hydro-science and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing China
  6. Ministry of Education Key Laboratory for Earth System Modeling, and Department of Earth System Science, Tsinghua University, Beijing China; Joint Center for Global Change Studies, Beijing China
  7. Department of Civil and Environmental Engineering, Washington State University, Pullman WA USA
  8. Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Wien, Vienna Austria
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1411920
Report Number(s):
PNNL-SA-125216
Journal ID: ISSN 0043-1397; KP1703030; KP1703010
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Water Resources Research; Journal Volume: 53; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Reservoir regulation; flood frequency curve; threshold behavior

Citation Formats

Wang, Wei, Li, Hong-Yi, Leung, L. Ruby, Yigzaw, Wondmagegn, Zhao, Jianshi, Lu, Hui, Deng, Zhiqun, Demisie, Yonas, and Blöschl, Günter. Nonlinear Filtering Effects of Reservoirs on Flood Frequency Curves at the Regional Scale: RESERVOIRS FILTER FLOOD FREQUENCY CURVES. United States: N. p., 2017. Web. doi:10.1002/2017WR020871.
Wang, Wei, Li, Hong-Yi, Leung, L. Ruby, Yigzaw, Wondmagegn, Zhao, Jianshi, Lu, Hui, Deng, Zhiqun, Demisie, Yonas, & Blöschl, Günter. Nonlinear Filtering Effects of Reservoirs on Flood Frequency Curves at the Regional Scale: RESERVOIRS FILTER FLOOD FREQUENCY CURVES. United States. doi:10.1002/2017WR020871.
Wang, Wei, Li, Hong-Yi, Leung, L. Ruby, Yigzaw, Wondmagegn, Zhao, Jianshi, Lu, Hui, Deng, Zhiqun, Demisie, Yonas, and Blöschl, Günter. Sun . "Nonlinear Filtering Effects of Reservoirs on Flood Frequency Curves at the Regional Scale: RESERVOIRS FILTER FLOOD FREQUENCY CURVES". United States. doi:10.1002/2017WR020871.
@article{osti_1411920,
title = {Nonlinear Filtering Effects of Reservoirs on Flood Frequency Curves at the Regional Scale: RESERVOIRS FILTER FLOOD FREQUENCY CURVES},
author = {Wang, Wei and Li, Hong-Yi and Leung, L. Ruby and Yigzaw, Wondmagegn and Zhao, Jianshi and Lu, Hui and Deng, Zhiqun and Demisie, Yonas and Blöschl, Günter},
abstractNote = {Anthropogenic activities, e.g., reservoir operation, may alter the characteristics of Flood Frequency Curve (FFC) and challenge the basic assumption of stationarity used in flood frequency analysis. This paper presents a combined data-modeling analysis of the nonlinear filtering effects of reservoirs on the FFCs over the contiguous United States. A dimensionless Reservoir Impact Index (RII), defined as the total upstream reservoir storage capacity normalized by the annual streamflow volume, is used to quantify reservoir regulation effects. Analyses are performed for 388 river stations with an average record length of 50 years. The first two moments of the FFC, mean annual maximum flood (MAF) and coefficient of variations (CV), are calculated for the pre- and post-dam periods and compared to elucidate the reservoir regulation effects as a function of RII. It is found that MAF generally decreases with increasing RII but stabilizes when RII exceeds a threshold value, and CV increases with RII until a threshold value beyond which CV decreases with RII. The processes underlying the nonlinear threshold behavior of MAF and CV are investigated using three reservoir models with different levels of complexity. All models capture the non-linear relationships of MAF and CV with RII, suggesting that the basic flood control function of reservoirs is key to the non-linear relationships. The relative roles of reservoir storage capacity, operation objectives, available storage prior to a flood event, and reservoir inflow pattern are systematically investigated. Our findings may help improve flood-risk assessment and mitigation in regulated river systems at the regional scale.},
doi = {10.1002/2017WR020871},
journal = {Water Resources Research},
number = 10,
volume = 53,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}