Drastic variations in estuarine morphodynamics in Southern Vietnam: Investigating riverbed sand mining impact through hydrodynamic modelling and field controls

Le, Anh Ngoc; Tran, Dung Duc; Nguyen, Thong; Van, Can Thu; Vinh, Dang Hoa; Au, Nguyen Hai; Park, Edward

doi:10.1016/j.jhydrol.2022.127572

Cited by 9 publications

(7 citation statements)

References 50 publications

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“…Riverbed deformation is usually accompanied by changes in river flow characteristics (Zhou, Xia, & Deng, 2019). For example, large‐scale mining activities in the Soai Rap Estuary of Vietnam have greatly altered the morphology of the Dong Nai River, including the hydrodynamic and sediment transport characteristics (Ngoc Anh et al, 2022). The LBR has undergone large amounts of degradation over the past 20 years, particularly in 1999–2012.…”

Section: Discussionmentioning

confidence: 99%

River adjustments in response to human activities: A case study of the lower Beijiang River, China

Ding,

Huang,

et al. 2023

Earth Surf Processes Landf

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Intensive human activity has caused significant changes in the river morphology and hydrological characteristics of the Pearl River Delta. Particularly, in‐channel mining and dam construction have induced remarkable levels of downward riverbed incision. Although strict control measures have been implemented for in‐channel sand mining, it remains unclear how the river has evolved since the abandonment of high‐intensity mining and its impact on flow diversion at the downstream confluence. This study presents the hydrological and morphological adjustments in the lower Beijiang River, the second largest tributary of the Pearl River, under the impacts of human interventions. A hydrodynamic model was developed to reveal the impacts of riverbed deformation on the flow diversion ratio at Sixianjiao, the confluence of the Beijaing River and the Xijiang River. The results showed that construction of cascade reservoirs upstream reach did not strongly influence run‐off, whereas incoming sediment loads were decreased. Because of upstream damming and in‐channel sand mining, a dramatic downward incision was observed in the lower Beijiang River, with a degradation volume of approximately 239.8 million m3 from 1999 to 2012. Particularly, in the upper reach, the incision depth was typically larger than 8 m. Riverbed incision caused continuous changes in the water stage–discharge relationship, and discharge increased remarkably under the same water level at the three hydrometric stations. During 2012–2020, because in‐channel sand mining was strictly controlled, rapid degradation was alleviated, deposition occurred in some cross‐sections and the deformation volume decreased by approximately 90% compared to that in the last period. A fast downward incision induced a change in flow exchange between the two rivers, and the flow diversion ratio of the Beijiang River increased from an average of 17% before 1998 to more than 21%.

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Section: Discussionmentioning

confidence: 99%

River adjustments in response to human activities: A case study of the lower Beijiang River, China

Ding,

Huang,

et al. 2023

Earth Surf Processes Landf

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“…As the simulation advances to a specific time point, t = t1, the initial conditions for u, v (x, y) and C (x, y) are established within the computational domain. The initial concentration value for C is set at 0.5 kg/m 3 .…”

Section: Figure 2 Mesh Initial Conditionsmentioning

confidence: 99%

“…Sand mining, which involves extracting sand from rivers, has a significant impact on the hydrodynamics and sediment transport within the river system [3,21]. When sand mining is conducted excessively, it results in the reduction of the river bed, destabilization of riverbanks, erosion, and alterations in the flow patterns [16].…”

Section: Introductionmentioning

confidence: 99%

“…However, these studies generally did not address the quantification of sand loss during the operation period. Limited research has been conducted on simulating bed morphology in relation to sand mining [3,9]. The researchers employed the TELEMAC-2D model to examine the alterations in estuarine morphology and hydrodynamics in the Soai Rap Estuary resulting from riverbed mining.…”

Section: Introductionmentioning

confidence: 99%

“…The researchers employed the TELEMAC-2D model to examine the alterations in estuarine morphology and hydrodynamics in the Soai Rap Estuary resulting from riverbed mining. The findings indicated that mining pits effectively trapped sediment, causing disruptions in sediment transport and morphological changes [3]. A different computational model, enhanced by high-performance computing, was utilized to simulate alterations in the riverbed within a specific section of the Mekong River, taking into account the presence of sand mining.…”

Section: Introductionmentioning

confidence: 99%

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Integration of a numerical model in curvilinear coordinates with sand mining component for bottom morphology simulation

Kim,

Huy,

Phuoc

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Numerical models for calculating bottom morphology are increasingly popular because of their long-term forecasting capabilities as well as their ability to identify causes. However, the simulation of bottom morphology, in addition to natural factors, is also governed by economic activities, especially sand mining. In this paper, we propose the development of the numerical model in curvilinear coordinates combined with a sand mining component that simulates the bottom morphology of the Tien river segment in the Mekong Delta as a study area. The modeling theory relies on the Reynolds equation system, which is combined with the suspended sediment transport equation in a two-dimensional curvilinear coordinate system. The process of averaging is performed over the depth. The suspended sediment transport equation incorporates a source function that describes the upward or downward movement of particles. In the model for bottom morphology, a component for sand mining is included, which accounts for the rate at which sand is extracted from the riverbed. This component is integrated into the equation governing the continuity of the bed load. The findings demonstrate that the numerical model effectively captures the changes in the river’s bottom morphology resulting from sand mining. Specifically, when the sand mining component is employed, the model accurately represents the actual development of the bottom morphology in river segments where sand mining occurs. Furthermore, the downstream bed alterations are significantly influenced by sand mining activities. By incorporating the sand mining component into the model, it becomes a valuable tool for simulating the bottom morphology in river segments subjected to sand mining, thus aiding in sand mining planning and the management of disaster risks associated with bank erosion.

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Response of streamflow and sediment variability to cascade dam development and climate change in the Sai Gon Dong Nai River basin

Nguyen,

Van Binh,

Tran

et al. 2024

Clim Dyn

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Drastic variations in estuarine morphodynamics in Southern Vietnam: Investigating riverbed sand mining impact through hydrodynamic modelling and field controls

Cited by 9 publications

References 50 publications

River adjustments in response to human activities: A case study of the lower Beijiang River, China

River adjustments in response to human activities: A case study of the lower Beijiang River, China

Integration of a numerical model in curvilinear coordinates with sand mining component for bottom morphology simulation

Response of streamflow and sediment variability to cascade dam development and climate change in the Sai Gon Dong Nai River basin

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