Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century

Tropical countries are already experiencing the adverse impacts of climate change. This study presents projections of climate change-driven variations in hydrology and sediment loads in the Kalu River Basin, Sri Lanka. Bias-corrected climate projections (i.e., precipitation and temperature) from thr...

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Autores principales:	T.A.J.G. Sirisena, Shreedhar Maskey, Janaka Bamunawala, Erika Coppola, Roshanka Ranasinghe
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Kalu river basin regional climate models streamflow sediment loads Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/be0e1c9003b74aed9188f723b1250f38
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spelling	oai:doaj.org-article:be0e1c9003b74aed9188f723b1250f382021-11-11T19:55:13ZProjected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century10.3390/w132130312073-4441https://doaj.org/article/be0e1c9003b74aed9188f723b1250f382021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/21/3031https://doaj.org/toc/2073-4441Tropical countries are already experiencing the adverse impacts of climate change. This study presents projections of climate change-driven variations in hydrology and sediment loads in the Kalu River Basin, Sri Lanka. Bias-corrected climate projections (i.e., precipitation and temperature) from three high resolution (25 km) regional climate models (viz., RegCM4-MIROC5, MPI-M-MPI-ESM-MR, and NCC-NORESM1-M) are used here to force a calibrated hydrological model to project streamflow and sediment loads for two future periods (mid-century: 2046–2065, and end of the century: 2081–2099) under two representative concentration pathways (i.e., RCPs 2.6 and 8.5). By the end of the century under RCP 8.5, all simulations (forced with the three RCMs) project increased annual streamflow (67–87%) and sediment loads (128–145%). In general, streamflow and sediment loads are projected to increase more during the southwest monsoon season (May–September) than in other periods. Furthermore, by the end of the century, all simulations under the RCP 8.5 project a shift of streamflow and sediment loads in the southwest monsoon peak from May to June, while preserving the peak in the inter-monsoon 2 (in October). The projected changes in annual sediment loads are greater than the projected changes in annual streamflow (in percentage) for both future periods.T.A.J.G. SirisenaShreedhar MaskeyJanaka BamunawalaErika CoppolaRoshanka RanasingheMDPI AGarticleKalu river basinregional climate modelsstreamflowsediment loadsHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3031, p 3031 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Kalu river basin regional climate models streamflow sediment loads Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	Kalu river basin regional climate models streamflow sediment loads Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 T.A.J.G. Sirisena Shreedhar Maskey Janaka Bamunawala Erika Coppola Roshanka Ranasinghe Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century
description	Tropical countries are already experiencing the adverse impacts of climate change. This study presents projections of climate change-driven variations in hydrology and sediment loads in the Kalu River Basin, Sri Lanka. Bias-corrected climate projections (i.e., precipitation and temperature) from three high resolution (25 km) regional climate models (viz., RegCM4-MIROC5, MPI-M-MPI-ESM-MR, and NCC-NORESM1-M) are used here to force a calibrated hydrological model to project streamflow and sediment loads for two future periods (mid-century: 2046–2065, and end of the century: 2081–2099) under two representative concentration pathways (i.e., RCPs 2.6 and 8.5). By the end of the century under RCP 8.5, all simulations (forced with the three RCMs) project increased annual streamflow (67–87%) and sediment loads (128–145%). In general, streamflow and sediment loads are projected to increase more during the southwest monsoon season (May–September) than in other periods. Furthermore, by the end of the century, all simulations under the RCP 8.5 project a shift of streamflow and sediment loads in the southwest monsoon peak from May to June, while preserving the peak in the inter-monsoon 2 (in October). The projected changes in annual sediment loads are greater than the projected changes in annual streamflow (in percentage) for both future periods.
format	article
author	T.A.J.G. Sirisena Shreedhar Maskey Janaka Bamunawala Erika Coppola Roshanka Ranasinghe
author_facet	T.A.J.G. Sirisena Shreedhar Maskey Janaka Bamunawala Erika Coppola Roshanka Ranasinghe
author_sort	T.A.J.G. Sirisena
title	Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century
title_short	Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century
title_full	Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century
title_fullStr	Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century
title_full_unstemmed	Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century
title_sort	projected streamflow and sediment supply under changing climate to the coast of the kalu river basin in tropical sri lanka over the 21st century
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/be0e1c9003b74aed9188f723b1250f38
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_version_	1718431373151174656

Projected Streamflow and Sediment Supply under Changing Climate to the Coast of the Kalu River Basin in Tropical Sri Lanka over the 21st Century

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