Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction

Park, Edward; Loc, Ho Huu; Tran, Dung Duc; Yang, Xiankun; Alcântara, Enner; Merino, Éder Renato; Son, Vu Hai

doi:10.1016/j.scitotenv.2020.138066

Cited by 77 publications

(42 citation statements)

References 47 publications

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“…Sand is one of the most important aggregate materials for the construction of infrastructure and buildings. With the development of the economy, sand mining activities in rivers have become universal, especially in some East and Southeast Asian countries, where sand excavation has been reported to impact the river environments [44][45][46]. How-ever, adequate information on the effects of sand excavation on the environment is still lacking, which poses challenges to regulation and management [47].…”

Section: Discussionmentioning

confidence: 99%

Using Satellite Remote Sensing to Study the Effect of Sand Excavation on the Suspended Sediment in the Hong Kong-Zhuhai-Macau Bridge Region

Liu

Zhang

et al. 2021

Water

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The Hong Kong-Zhuhai-Macau Bridge crosses the Pearl River Estuary and is the largest bridge and tunnel project in the world. During the construction period of this project, the excessive suspended sediment was found in the construction region. The suspended sediment generated by sand excavation in the upstream was assumed to have a significant impact on the suspended sediment in the tunnel region. In this study, we assessed the impact of upstream sand excavation on the suspended sediment in the Hong Kong-Zhuhai-Macau Bridge construction area using Landsat OLI, ETM+, and TM data. Regional suspended sediment algorithms were developed for Landsat using a symbolic regression method based on data from in situ measurements in the study area from 2003 to 2014. A band shift was conducted on the remote sensing reflectance data from Landsat ETM+ and OLI to produce a time series of the suspended sediment concentrations that was internally consistent with that of the Landsat TM data. The suspended sediment distribution was extracted and used to compare under two different conditions, with and without sand excavation. The correlations of the time series of the suspended sediment concentrations in different regions in the surrounding waters, including the correlations between the construction regions and the sand excavation regions, were calculated. Our results indicated that the sand excavation north of the Pearl River Estuary had a limited impact on the surface suspended sediment concentrations in the Hong Kong-Zhuhai-Macau Bridge tunnel area.

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Section: Discussionmentioning

confidence: 99%

Using Satellite Remote Sensing to Study the Effect of Sand Excavation on the Suspended Sediment in the Hong Kong-Zhuhai-Macau Bridge Region

Liu

Zhang

et al. 2021

Water

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“…Surge in industrial activities along with rising population has led to construction of dams, barrages, and canal across the Ganga and its tributaries to encounter the increased requirements of energy and food, leading to alteration in flow. Ganga basin is also experiencing a significant increase in construction activities which has led to increased rate of mining from Ganga River and its tributaries which is adversely affecting the morphology of the river (Barman et al 2019;Park et al 2020). The flow of the river is also influenced by rituals.…”

Section: Farakkamentioning

confidence: 99%

Trend analysis of hydrological parameters of Ganga River

Zakwan

Ahmad

2021

Arab J Geosci

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Ganga River basin, being the largest river basin in India, adheres with its social and spiritual importance for the country. Although many studies have been conducted on the Ganga basin, however, trend observed in flow and sediment yield in Ganga River has been scarcely studied. Alteration in flow pattern and sediment transport in rivers brings remarkable impact on river geomorphology and entire ecosystem of the region. The present paper attempts to identify trends observed in Ganga River in terms of annual maximum and annual minimum discharges, water and sediment yield during monsoon season. The trend analysis was accomplished by performing the Mann-Kendall (M-K), Sen's slope, and innovative trend analysis at various gauging sites along the river for the monsoon months. Significance of trend tests were tested at 5% significance level. Innovative trend analysis (ITA) revealed non-monotonicity within the time series and provided more detailed understanding of changes in hydrological changes. While observed annual maximum discharge showed a negative trend at almost all the sites, annual minimum discharge showed positive trend at gauging sites upstream of confluence of Yamuna River. Data of discharge and sediment load for monsoon months also revealed declining trends at most of the gauging sites. Water and sediment yields at all sites except Gandhighat showed a negative trend. Decline in trend of sediment and water yield is more pronounced in Western Ganga Plain (WGP) as compared to Eastern Ganga Plain (EGP). Incorporating these trends can be helpful for various water management projects in the future. Both climatic factors and human intervention appear to be responsible for the alteration in flow pattern of Ganga River.

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“…However, these high dikes reduce the availability of fertile silt and force farmers to rely on costly agrochemicals to maintain yields Tran and Weger, 2018). Though there is substantial research on sand mining and upstream dam construction, these non-related anthropogenic factors are often not linked to agricultural productivity even though reduced sediment availability and increased channel erosion would have adverse implications on agricultural productivity (Binh et al, 2020;Park et al, 2020;Jordan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Interacting effects of land-use change and natural hazards on rice agriculture in the Mekong and Red River deltas in Vietnam

Yuen

Hanh

Quynh³

et al. 2021

Nat. Hazards Earth Syst. Sci.

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Abstract. Vietnam is a major rice producer, and much of the rice grown is concentrated in the Red River Delta (RRD) and the Mekong River Delta (MRD). While the two deltas are highly productive regions, they are vulnerable to natural hazards and the effects of human-induced environmental change. To show that the processes and issues affecting food security are reinforcing, interdependent and operating at multiple scales, we used a systems-thinking approach to represent the major linkages between anthropogenic land-use and natural hazards and elaborate on how the drivers and environmental processes interact and influence rice growing area, rice yield and rice quality in the two deltas. On a local scale, demand for aquaculture and alternative crops, urban expansion, dike development, sand mining and groundwater extraction decrease rice production in the two deltas. Regionally, upstream dam construction impacts rice production in the two deltas despite being distally situated. Separately, the localized natural hazards that have adversely affected rice production include droughts, floods and typhoons. Outbreaks of pests and diseases are also common. Climate-change-induced sea level rise is a global phenomenon that will affect agricultural productivity. Notably, anthropogenic developments meant to improve agricultural productivity or increase economic growth can create many unwanted environmental consequences such as an increase in flooding, saltwater intrusion and land subsidence, which in turn decreases rice production and quality. In addition, natural hazards may amplify the problems created by human activities. Our meta-analysis highlights the ways in which a systems-thinking approach can yield more nuanced perspectives to tackle “wicked” and interrelated environmental challenges. Given that deltas worldwide are globally significant for food production and are highly stressed and degraded, a systems-thinking approach can be applied to provide a holistic and contextualized overview of the threats faced in each location.

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Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction

Cited by 77 publications

References 47 publications

Using Satellite Remote Sensing to Study the Effect of Sand Excavation on the Suspended Sediment in the Hong Kong-Zhuhai-Macau Bridge Region

Using Satellite Remote Sensing to Study the Effect of Sand Excavation on the Suspended Sediment in the Hong Kong-Zhuhai-Macau Bridge Region

Trend analysis of hydrological parameters of Ganga River

Interacting effects of land-use change and natural hazards on rice agriculture in the Mekong and Red River deltas in Vietnam

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