Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario

Brahmaputra River Basin (BRB), the largest contributor of sediment load in Ganges–Brahmaputra–Meghna delta, is highly vulnerable to future climate change. Several studies assessed the effects of climate change of BRB on river flow but an assessment on sediment load has not been conducted. Changes in...

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Autores principales:	Shammi Haque, Md. Mostafa Ali, A. K. M. Saiful Islam, Jamal Uddin Khan
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	bengal delta brahmaputra river basin cordex-sa hec-hms musle sediment load Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/f11a5c9f03754bbb9ef28e3cf2aba67e
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spelling	oai:doaj.org-article:f11a5c9f03754bbb9ef28e3cf2aba67e2021-11-05T18:48:28ZChanges in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario2040-22442408-935410.2166/wcc.2020.219https://doaj.org/article/f11a5c9f03754bbb9ef28e3cf2aba67e2021-05-01T00:00:00Zhttp://jwcc.iwaponline.com/content/12/3/937https://doaj.org/toc/2040-2244https://doaj.org/toc/2408-9354Brahmaputra River Basin (BRB), the largest contributor of sediment load in Ganges–Brahmaputra–Meghna delta, is highly vulnerable to future climate change. Several studies assessed the effects of climate change of BRB on river flow but an assessment on sediment load has not been conducted. Changes in sediment load in the future need to be assessed to control and manage sediment flows in large catchments properly. The present study focuses on developing a hydrological and sediment routing model of BRB using the HEC-HMS model to estimate future sediment load together with the flow for the RCP 8.5 climate scenario. Modified Universal Soil Loss Equation and Engelund Hansen method of HEC-HMS have been applied for the sediment transport of BRB. The model has been calibrated using daily runoff for the period 1983–1996 and validated for the period 1997–2010, respectively. The uncertainty in the percentage change in seasonal sediment load during the pre-monsoon season is higher than that of the monsoon season. However, the contribution of the sediment load of pre-monsoon is very much lower than the monsoon season. The percentage changes in mean annual sediment load compared to the baseline period for the 2020s, 2050s and 2080s are 34, 67 and 115%, respectively. HIGHLIGHTS This is the first attempt to assess the future changes in the sediment load of the Brahmaputra River Basin (BRB).; Soil Moisture Accounting (SMA) method was used for simulating continuous rainfall–runoff processes.; The hydrological model was developed using a high-resolution bias-corrected multi-model ensemble RCM.; The percent changes in mean annual sediment load for the years of 2010–2039 (2020s), 2040–2069 (2050s) and 2070–2099 (2080s) are 34, 67 and 115%, respectively.; The uncertainties associated with the projected sediment loads of BRB increase with time in the future.;Shammi HaqueMd. Mostafa AliA. K. M. Saiful IslamJamal Uddin KhanIWA Publishingarticlebengal deltabrahmaputra river basincordex-sahec-hmsmuslesediment loadEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350ENJournal of Water and Climate Change, Vol 12, Iss 3, Pp 937-954 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bengal delta brahmaputra river basin cordex-sa hec-hms musle sediment load Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
spellingShingle	bengal delta brahmaputra river basin cordex-sa hec-hms musle sediment load Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Shammi Haque Md. Mostafa Ali A. K. M. Saiful Islam Jamal Uddin Khan Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario
description	Brahmaputra River Basin (BRB), the largest contributor of sediment load in Ganges–Brahmaputra–Meghna delta, is highly vulnerable to future climate change. Several studies assessed the effects of climate change of BRB on river flow but an assessment on sediment load has not been conducted. Changes in sediment load in the future need to be assessed to control and manage sediment flows in large catchments properly. The present study focuses on developing a hydrological and sediment routing model of BRB using the HEC-HMS model to estimate future sediment load together with the flow for the RCP 8.5 climate scenario. Modified Universal Soil Loss Equation and Engelund Hansen method of HEC-HMS have been applied for the sediment transport of BRB. The model has been calibrated using daily runoff for the period 1983–1996 and validated for the period 1997–2010, respectively. The uncertainty in the percentage change in seasonal sediment load during the pre-monsoon season is higher than that of the monsoon season. However, the contribution of the sediment load of pre-monsoon is very much lower than the monsoon season. The percentage changes in mean annual sediment load compared to the baseline period for the 2020s, 2050s and 2080s are 34, 67 and 115%, respectively. HIGHLIGHTS This is the first attempt to assess the future changes in the sediment load of the Brahmaputra River Basin (BRB).; Soil Moisture Accounting (SMA) method was used for simulating continuous rainfall–runoff processes.; The hydrological model was developed using a high-resolution bias-corrected multi-model ensemble RCM.; The percent changes in mean annual sediment load for the years of 2010–2039 (2020s), 2040–2069 (2050s) and 2070–2099 (2080s) are 34, 67 and 115%, respectively.; The uncertainties associated with the projected sediment loads of BRB increase with time in the future.;
format	article
author	Shammi Haque Md. Mostafa Ali A. K. M. Saiful Islam Jamal Uddin Khan
author_facet	Shammi Haque Md. Mostafa Ali A. K. M. Saiful Islam Jamal Uddin Khan
author_sort	Shammi Haque
title	Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario
title_short	Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario
title_full	Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario
title_fullStr	Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario
title_full_unstemmed	Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario
title_sort	changes in flow and sediment load of poorly gauged brahmaputra river basin under an extreme climate scenario
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/f11a5c9f03754bbb9ef28e3cf2aba67e
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_version_	1718444139028152320

Changes in flow and sediment load of poorly gauged Brahmaputra river basin under an extreme climate scenario

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