Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands

Floodplain wetlands of low-gradient rivers are especially sensitive to alteration of hydrologic conditions. Although many studies have investigated changes in downstream hydrologic regimes caused by river dam construction, no study has specifically quantified the long-term effect of altered flood pu...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Liwen Chen, Yanfeng Wu, Y. Jun Xu, Guangxin Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Floodplain wetlands Remote sensing Inundation pattern Damming effect Flood pulse Nenjiang River Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/077e0be38e7642d59598cd94c7fa4a60
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:077e0be38e7642d59598cd94c7fa4a60
record_format	dspace
spelling	oai:doaj.org-article:077e0be38e7642d59598cd94c7fa4a602021-12-01T04:45:36ZAlteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands1470-160X10.1016/j.ecolind.2021.107406https://doaj.org/article/077e0be38e7642d59598cd94c7fa4a602021-05-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21000716https://doaj.org/toc/1470-160XFloodplain wetlands of low-gradient rivers are especially sensitive to alteration of hydrologic conditions. Although many studies have investigated changes in downstream hydrologic regimes caused by river dam construction, no study has specifically quantified the long-term effect of altered flood pulse on floodplain wetlands. Such knowledge is needed to develop effective dam operation strategies and plans for downstream wetland protection and restoration. We applied data time series from 1984 to 2018 to delineate the inundation extent of floodplain wetlands during the pre- (1984–2005) and post-dam (2006–2018) periods. Four segments of the 360-km river reach were selected to investigate how inundation frequency of floodplain wetlands responded to changes in flow regimes and flood pulse for both periods associated with dam operation. The results showed that the water area slightly increased as a result of recharging water from dam, while the inundation frequency of adjacent floodplain wetlands overall reduced because of lower magnitude of flood pulse. Inundation area of four segments show less variation during the post-dam period compared to the pre-dam period. These findings clearly indicate that decreased flood pulses caused by dam operations reduce both inundation frequency and areal extent of floodplain wetlands. Based on the findings, we propose an inundation threshold that can be used for dam operation to protect and restore river corridor and floodplain ecosystems.Liwen ChenYanfeng WuY. Jun XuGuangxin ZhangElsevierarticleFloodplain wetlandsRemote sensingInundation patternDamming effectFlood pulseNenjiang RiverEcologyQH540-549.5ENEcological Indicators, Vol 124, Iss , Pp 107406- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Floodplain wetlands Remote sensing Inundation pattern Damming effect Flood pulse Nenjiang River Ecology QH540-549.5
spellingShingle	Floodplain wetlands Remote sensing Inundation pattern Damming effect Flood pulse Nenjiang River Ecology QH540-549.5 Liwen Chen Yanfeng Wu Y. Jun Xu Guangxin Zhang Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands
description	Floodplain wetlands of low-gradient rivers are especially sensitive to alteration of hydrologic conditions. Although many studies have investigated changes in downstream hydrologic regimes caused by river dam construction, no study has specifically quantified the long-term effect of altered flood pulse on floodplain wetlands. Such knowledge is needed to develop effective dam operation strategies and plans for downstream wetland protection and restoration. We applied data time series from 1984 to 2018 to delineate the inundation extent of floodplain wetlands during the pre- (1984–2005) and post-dam (2006–2018) periods. Four segments of the 360-km river reach were selected to investigate how inundation frequency of floodplain wetlands responded to changes in flow regimes and flood pulse for both periods associated with dam operation. The results showed that the water area slightly increased as a result of recharging water from dam, while the inundation frequency of adjacent floodplain wetlands overall reduced because of lower magnitude of flood pulse. Inundation area of four segments show less variation during the post-dam period compared to the pre-dam period. These findings clearly indicate that decreased flood pulses caused by dam operations reduce both inundation frequency and areal extent of floodplain wetlands. Based on the findings, we propose an inundation threshold that can be used for dam operation to protect and restore river corridor and floodplain ecosystems.
format	article
author	Liwen Chen Yanfeng Wu Y. Jun Xu Guangxin Zhang
author_facet	Liwen Chen Yanfeng Wu Y. Jun Xu Guangxin Zhang
author_sort	Liwen Chen
title	Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands
title_short	Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands
title_full	Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands
title_fullStr	Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands
title_full_unstemmed	Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands
title_sort	alteration of flood pulses by damming the nenjiang river, china – implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/077e0be38e7642d59598cd94c7fa4a60
work_keys_str_mv	AT liwenchen alterationoffloodpulsesbydammingthenenjiangriverchinaimplicationfortheneedtoidentifyahydrographbasedinundationthresholdforprotectingfloodplainwetlands AT yanfengwu alterationoffloodpulsesbydammingthenenjiangriverchinaimplicationfortheneedtoidentifyahydrographbasedinundationthresholdforprotectingfloodplainwetlands AT yjunxu alterationoffloodpulsesbydammingthenenjiangriverchinaimplicationfortheneedtoidentifyahydrographbasedinundationthresholdforprotectingfloodplainwetlands AT guangxinzhang alterationoffloodpulsesbydammingthenenjiangriverchinaimplicationfortheneedtoidentifyahydrographbasedinundationthresholdforprotectingfloodplainwetlands
_version_	1718405763039232000

Alteration of flood pulses by damming the Nenjiang River, China – Implication for the need to identify a hydrograph-based inundation threshold for protecting floodplain wetlands

Ejemplares similares