Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.scitotenv.2020.138066 http://hdl.handle.net/11449/195403 |
Resumo: | Here we present a proof of concept evaluation of the impacts of riverbed-mining on river-wetland connectivity by analyzing the temporal trends of the flood frequencies in the Vietnamese Mekong Delta (VMD), while accounting for the effect of dyke constructions. We focus on the Long Xuyen Quadrangle (LXQ), which is significant in terms of biodiversity and economic contribution to the VMD as it is one of the most important food baskets of Southeast Asia that depends on seasonal flooding. Our results indicate that the flood frequency in LXQ has decreased significantly over the past 20 years (1995-2015). Time-series analyses of water level data at Chau Doc, Tan Chau, and Can Tho stations confirmed that the overall descending trend is statistically significant (p-value < 0.001 and tau similar to 0.1). However, the river discharge at Kratie showed no significant trend (p-value = 0.98) over the same period. This indicates that the flood frequency is associated with the lowering of the riverbed (incision) other than climatic factors. The connectivity analysis also revealed a remarkable drop in the inundation duration after early 2000, which corresponds to the previous observations of the shifting shoreline of the VMD from construction to shrinking. Finally, regression and principal component analyses underpinned the strong causality between the riverbed-mining and the decreased seasonal flooding patterns in LXQ, while accounting for the effect of the dyke system over the last decades (R-2 = 0.75). This study offers compelling evidences on the relationship between sand-mining in the river and the disrupted flood regimes in VMD. The reduction in water and sediments that is necessary for sustaining current rates of agricultural production in the long term would endanger the livelihoods of millions of VMD inhabitants. (C) 2020 Elsevier B.V. All rights reserved. |
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Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke constructionFloodsFlood frequencySand miningDykesMekong RiverVietnamHere we present a proof of concept evaluation of the impacts of riverbed-mining on river-wetland connectivity by analyzing the temporal trends of the flood frequencies in the Vietnamese Mekong Delta (VMD), while accounting for the effect of dyke constructions. We focus on the Long Xuyen Quadrangle (LXQ), which is significant in terms of biodiversity and economic contribution to the VMD as it is one of the most important food baskets of Southeast Asia that depends on seasonal flooding. Our results indicate that the flood frequency in LXQ has decreased significantly over the past 20 years (1995-2015). Time-series analyses of water level data at Chau Doc, Tan Chau, and Can Tho stations confirmed that the overall descending trend is statistically significant (p-value < 0.001 and tau similar to 0.1). However, the river discharge at Kratie showed no significant trend (p-value = 0.98) over the same period. This indicates that the flood frequency is associated with the lowering of the riverbed (incision) other than climatic factors. The connectivity analysis also revealed a remarkable drop in the inundation duration after early 2000, which corresponds to the previous observations of the shifting shoreline of the VMD from construction to shrinking. Finally, regression and principal component analyses underpinned the strong causality between the riverbed-mining and the decreased seasonal flooding patterns in LXQ, while accounting for the effect of the dyke system over the last decades (R-2 = 0.75). This study offers compelling evidences on the relationship between sand-mining in the river and the disrupted flood regimes in VMD. The reduction in water and sediments that is necessary for sustaining current rates of agricultural production in the long term would endanger the livelihoods of millions of VMD inhabitants. (C) 2020 Elsevier B.V. All rights reserved.SUG-NAP by the National Institute of Education at Nanyang Technological UniversityFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Nanyang Technol Univ, Natl Inst Educ, Singapore, SingaporeNanyang Technol Univ, Asian Sch Environm, Singapore, SingaporeVietnam Natl Univ, Ctr Water Management & Climate Change, Inst Environm & Resources, Ho Chi Minh City, VietnamGuangzhou Univ, Sch Geog Sci, Guangzhou, Peoples R ChinaSao Paulo State Univ, Dept Environm Engn, Sao Paulo, BrazilUniv Sao Paulo, Inst Energy & Environm, Sao Paulo, BrazilThuyloi Univ, Fac Water Resources & Engn, Hanoi, VietnamSao Paulo State Univ, Dept Environm Engn, Sao Paulo, BrazilSUG-NAP by the National Institute of Education at Nanyang Technological University: 3/19FAPESP: 2017/26318-8Elsevier B.V.Nanyang Technol UnivVietnam Natl UnivGuangzhou UnivUniversidade Estadual Paulista (Unesp)Universidade de São Paulo (USP)Thuyloi UnivPark, EdwardHuu Loc HoDung Duc TranYang, XiankunAlcantara, Enner [UNESP]Merino, EderVu Hai Son2020-12-10T17:33:34Z2020-12-10T17:33:34Z2020-06-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article9http://dx.doi.org/10.1016/j.scitotenv.2020.138066Science Of The Total Environment. Amsterdam: Elsevier, v. 723, 9 p., 2020.0048-9697http://hdl.handle.net/11449/19540310.1016/j.scitotenv.2020.138066WOS:000535897200007Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengScience Of The Total Environmentinfo:eu-repo/semantics/openAccess2021-10-22T21:54:40Zoai:repositorio.unesp.br:11449/195403Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:23:15.275176Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction |
title |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction |
spellingShingle |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction Park, Edward Floods Flood frequency Sand mining Dykes Mekong River Vietnam |
title_short |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction |
title_full |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction |
title_fullStr |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction |
title_full_unstemmed |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction |
title_sort |
Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction |
author |
Park, Edward |
author_facet |
Park, Edward Huu Loc Ho Dung Duc Tran Yang, Xiankun Alcantara, Enner [UNESP] Merino, Eder Vu Hai Son |
author_role |
author |
author2 |
Huu Loc Ho Dung Duc Tran Yang, Xiankun Alcantara, Enner [UNESP] Merino, Eder Vu Hai Son |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Nanyang Technol Univ Vietnam Natl Univ Guangzhou Univ Universidade Estadual Paulista (Unesp) Universidade de São Paulo (USP) Thuyloi Univ |
dc.contributor.author.fl_str_mv |
Park, Edward Huu Loc Ho Dung Duc Tran Yang, Xiankun Alcantara, Enner [UNESP] Merino, Eder Vu Hai Son |
dc.subject.por.fl_str_mv |
Floods Flood frequency Sand mining Dykes Mekong River Vietnam |
topic |
Floods Flood frequency Sand mining Dykes Mekong River Vietnam |
description |
Here we present a proof of concept evaluation of the impacts of riverbed-mining on river-wetland connectivity by analyzing the temporal trends of the flood frequencies in the Vietnamese Mekong Delta (VMD), while accounting for the effect of dyke constructions. We focus on the Long Xuyen Quadrangle (LXQ), which is significant in terms of biodiversity and economic contribution to the VMD as it is one of the most important food baskets of Southeast Asia that depends on seasonal flooding. Our results indicate that the flood frequency in LXQ has decreased significantly over the past 20 years (1995-2015). Time-series analyses of water level data at Chau Doc, Tan Chau, and Can Tho stations confirmed that the overall descending trend is statistically significant (p-value < 0.001 and tau similar to 0.1). However, the river discharge at Kratie showed no significant trend (p-value = 0.98) over the same period. This indicates that the flood frequency is associated with the lowering of the riverbed (incision) other than climatic factors. The connectivity analysis also revealed a remarkable drop in the inundation duration after early 2000, which corresponds to the previous observations of the shifting shoreline of the VMD from construction to shrinking. Finally, regression and principal component analyses underpinned the strong causality between the riverbed-mining and the decreased seasonal flooding patterns in LXQ, while accounting for the effect of the dyke system over the last decades (R-2 = 0.75). This study offers compelling evidences on the relationship between sand-mining in the river and the disrupted flood regimes in VMD. The reduction in water and sediments that is necessary for sustaining current rates of agricultural production in the long term would endanger the livelihoods of millions of VMD inhabitants. (C) 2020 Elsevier B.V. All rights reserved. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-10T17:33:34Z 2020-12-10T17:33:34Z 2020-06-25 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.scitotenv.2020.138066 Science Of The Total Environment. Amsterdam: Elsevier, v. 723, 9 p., 2020. 0048-9697 http://hdl.handle.net/11449/195403 10.1016/j.scitotenv.2020.138066 WOS:000535897200007 |
url |
http://dx.doi.org/10.1016/j.scitotenv.2020.138066 http://hdl.handle.net/11449/195403 |
identifier_str_mv |
Science Of The Total Environment. Amsterdam: Elsevier, v. 723, 9 p., 2020. 0048-9697 10.1016/j.scitotenv.2020.138066 WOS:000535897200007 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Science Of The Total Environment |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
9 |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1808128803040395264 |