Uncertainties and risks in reservoir operations under changing hydroclimatic conditions

Uncertainties and risks associated with hydroclimatic variations pose a challenge to the management and planning of water resources systems. This study demonstrates the importance of understanding the changing hydrologic regime of the Feather River Basin (FRB) and its impacts on water resources deci...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Ali Aljoda, Shaleen Jain
Formato: article
Lenguaje:EN
Publicado: IWA Publishing 2021
Materias:
Acceso en línea:https://doaj.org/article/b41cee4929b243d3b76aa2071204c5f1
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
id oai:doaj.org-article:b41cee4929b243d3b76aa2071204c5f1
record_format dspace
spelling oai:doaj.org-article:b41cee4929b243d3b76aa2071204c5f12021-11-05T19:01:49ZUncertainties and risks in reservoir operations under changing hydroclimatic conditions2040-22442408-935410.2166/wcc.2020.133https://doaj.org/article/b41cee4929b243d3b76aa2071204c5f12021-08-01T00:00:00Zhttp://jwcc.iwaponline.com/content/12/5/1708https://doaj.org/toc/2040-2244https://doaj.org/toc/2408-9354Uncertainties and risks associated with hydroclimatic variations pose a challenge to the management and planning of water resources systems. This study demonstrates the importance of understanding the changing hydrologic regime of the Feather River Basin (FRB) and its impacts on water resources decision variables (i.e., storage requirement and performance of a water supply reservoir). A simple storage–yield–reliability model (S–Y–R) is used to quantify the risk of the stationary-based designed reservoir under the temporal variation and nonstationarity in N-year blocks of the Feather River Inflow into Lake Oroville (FRI). Furthermore, the potential linkages of the long-term variability in the FRI to climate variations are investigated by applying wavelet spectrum and coherence analysis to the FRI and atmospheric–oceanic indices (e.g., ENSO and PDO). The results show substantial variations in the FRB hydrologic regime over different timescales with episodes of abrupt shifts toward significantly higher storage requirements, and decrease in the reservoir performance during historical periods of high FRI variance and lag-1 serial correlation. Although the mean inflows are high, the storage capacity is increased by (a) 38 and 48% due to the 5 and 20% increase in the FRI variance during the periods 1904–1953 and 1960–2009, respectively, and (b) 34% due to the increase in the serial correlation coefficient in the period of 1750–1799. Likewise, reservoir performance significantly decreased for the same reasons in the same critical periods. The reliability and resilience dropped to 74 and 29% (1904–1953) and to 76 and 50% (1960–2009 period) due to the increased variance of FRI, while vulnerability reached 70% during the high lag-1 correlations in 1532–1581 and 1564–1613, and 40% in 1904–1953 due to the high FRI variance. Furthermore, the wavelet coherence analysis observes strong associations between the streamflow and climate teleconnection patterns in specific periodic cycles during the same critical periods which link the variability in FRI and decision variables to the hydroclimatic variations. These linkages give a primary indication for the reservoir storage requirement characterization. HIGHLIGHTS The river basin hydrologic regime varies over time within different timescales.; The reservoir's storage requirements and performance are very sensitive to the nonstationarity of the streamflow standard deviation and serial correlation.; Changing climate plays a key role in the water management and planning.; The dynamic risk analysis overcomes the limitation of the stationarity-based designs and analysis.;Ali AljodaShaleen JainIWA Publishingarticlechanging hydrologic regimeclimate changedynamic risknonstationaritystreamflow variabilityuncertaintyEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350ENJournal of Water and Climate Change, Vol 12, Iss 5, Pp 1708-1723 (2021)
institution DOAJ
collection DOAJ
language EN
topic changing hydrologic regime
climate change
dynamic risk
nonstationarity
streamflow variability
uncertainty
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
spellingShingle changing hydrologic regime
climate change
dynamic risk
nonstationarity
streamflow variability
uncertainty
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
Ali Aljoda
Shaleen Jain
Uncertainties and risks in reservoir operations under changing hydroclimatic conditions
description Uncertainties and risks associated with hydroclimatic variations pose a challenge to the management and planning of water resources systems. This study demonstrates the importance of understanding the changing hydrologic regime of the Feather River Basin (FRB) and its impacts on water resources decision variables (i.e., storage requirement and performance of a water supply reservoir). A simple storage–yield–reliability model (S–Y–R) is used to quantify the risk of the stationary-based designed reservoir under the temporal variation and nonstationarity in N-year blocks of the Feather River Inflow into Lake Oroville (FRI). Furthermore, the potential linkages of the long-term variability in the FRI to climate variations are investigated by applying wavelet spectrum and coherence analysis to the FRI and atmospheric–oceanic indices (e.g., ENSO and PDO). The results show substantial variations in the FRB hydrologic regime over different timescales with episodes of abrupt shifts toward significantly higher storage requirements, and decrease in the reservoir performance during historical periods of high FRI variance and lag-1 serial correlation. Although the mean inflows are high, the storage capacity is increased by (a) 38 and 48% due to the 5 and 20% increase in the FRI variance during the periods 1904–1953 and 1960–2009, respectively, and (b) 34% due to the increase in the serial correlation coefficient in the period of 1750–1799. Likewise, reservoir performance significantly decreased for the same reasons in the same critical periods. The reliability and resilience dropped to 74 and 29% (1904–1953) and to 76 and 50% (1960–2009 period) due to the increased variance of FRI, while vulnerability reached 70% during the high lag-1 correlations in 1532–1581 and 1564–1613, and 40% in 1904–1953 due to the high FRI variance. Furthermore, the wavelet coherence analysis observes strong associations between the streamflow and climate teleconnection patterns in specific periodic cycles during the same critical periods which link the variability in FRI and decision variables to the hydroclimatic variations. These linkages give a primary indication for the reservoir storage requirement characterization. HIGHLIGHTS The river basin hydrologic regime varies over time within different timescales.; The reservoir's storage requirements and performance are very sensitive to the nonstationarity of the streamflow standard deviation and serial correlation.; Changing climate plays a key role in the water management and planning.; The dynamic risk analysis overcomes the limitation of the stationarity-based designs and analysis.;
format article
author Ali Aljoda
Shaleen Jain
author_facet Ali Aljoda
Shaleen Jain
author_sort Ali Aljoda
title Uncertainties and risks in reservoir operations under changing hydroclimatic conditions
title_short Uncertainties and risks in reservoir operations under changing hydroclimatic conditions
title_full Uncertainties and risks in reservoir operations under changing hydroclimatic conditions
title_fullStr Uncertainties and risks in reservoir operations under changing hydroclimatic conditions
title_full_unstemmed Uncertainties and risks in reservoir operations under changing hydroclimatic conditions
title_sort uncertainties and risks in reservoir operations under changing hydroclimatic conditions
publisher IWA Publishing
publishDate 2021
url https://doaj.org/article/b41cee4929b243d3b76aa2071204c5f1
work_keys_str_mv AT alialjoda uncertaintiesandrisksinreservoiroperationsunderchanginghydroclimaticconditions
AT shaleenjain uncertaintiesandrisksinreservoiroperationsunderchanginghydroclimaticconditions
_version_ 1718444060610396160