Monsoon-influenced variations in morphology and sediment of a mesotidal beach on the Mekong River delta coast

Tamura, Takeshi; Horaguchi, Keishi; Saito, Yoshiki; Nguyen, Van Lap; Tateishi, Masaaki; Ta, Thi Kim Oanh; Nanayama, Futoshi; Watanabe, Kazuaki

doi:10.1016/j.geomorph.2009.10.003

Cited by 94 publications

(75 citation statements)

References 27 publications

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“…This information can be used as boundary conditions for studies on sediment transport and erosion along the coast and the subaqueous delta. This is currently a hot topic as well, since the coastline of the Mekong Delta is subject to considerable erosion (Tamura et al, 2010;Anthony et al, 2013). Finally, the model can be used to quantify impacts of planned and ongoing dam construction in the Mekong Basin in terms of floodplain deposition and sediment distribution in the Mekong Delta.…”

Section: Discussionmentioning

confidence: 99%

“…In order to quantify the benefit of nutrient deposition in inundated compartments, we compare the cumulative nutrient deposition rate with the average total amount of N, P, K fertilizers that is applied to rice crops in the wet season (Khuong et al, 2007). The cost of fertilizers and pesticides respectively amount to approximately 40 and 15 % of the total costs per rice crop season (Thong et al, 2011;Phuong and Xe, 2011). Table 5 shows the average N, P, K deposition in floodplains and the N, P, K requirements for a rice crop.…”

Section: Sedimentation and Nutrient Deposition In The Vmd Floodplainsmentioning

confidence: 99%

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Large-scale suspended sediment transport and sediment deposition in the Mekong Delta

Manh

Dũng

Hung

et al. 2014

Hydrol. Earth Syst. Sci.

123

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Abstract. Sediment dynamics play a major role in the agricultural and fishery productivity of the Mekong Delta. However, the understanding of sediment dynamics in the delta, one of the most complex river deltas in the world, is very limited. This is a consequence of its large extent, the intricate system of rivers, channels and floodplains, and the scarcity of observations. This study quantifies, for the first time, the suspended sediment transport and sediment deposition in the whole Mekong Delta. To this end, a quasi-2D hydrodynamic model is combined with a cohesive sediment transport model. The combined model is calibrated using six objective functions to represent the different aspects of the hydraulic and sediment transport components. The model is calibrated for the extreme flood season in 2011 and shows good performance for 2 validation years with very different flood characteristics. It is shown how sediment transport and sediment deposition is differentiated from Kratie at the entrance of the delta on its way to the coast. The main factors influencing the spatial sediment dynamics are the river and channel system, dike rings, sluice gate operations, the magnitude of the floods, and tidal influences. The superposition of these factors leads to high spatial variability of sediment transport, in particular in the Vietnamese floodplains. Depending on the flood magnitude, annual sediment loads reaching the coast vary from 48 to 60 % of the sediment load at Kratie. Deposited sediment varies from 19 to 23 % of the annual load at Kratie in Cambodian floodplains, and from 1 to 6 % in the compartmented and diked floodplains in Vietnam. Annual deposited nutrients (N, P, K), which are associated with the sediment deposition, provide on average more than 50 % of mineral fertilizers typically applied for rice crops in non-flooded ring dike floodplains in Vietnam.Through the quantification of sediment and related nutrient input, the presented study provides a quantitative basis for estimating the benefits of annual Mekong floods for agriculture and fishery, and is an important piece of information with regard to the assessment of the impacts of deltaic subsidence and climate-change-related sea level rise on delta morphology.

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Section: Discussionmentioning

confidence: 99%

Section: Sedimentation and Nutrient Deposition In The Vmd Floodplainsmentioning

confidence: 99%

Large-scale suspended sediment transport and sediment deposition in the Mekong Delta

Manh

Dũng

Hung

et al. 2014

Hydrol. Earth Syst. Sci.

123

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“…: 58 mm) into the sediment. The topography of these lines was described by Tamura et al (2010) as line A and line BN, respectively. The samples were cut at intervals of 3-6 cm, put into polyethylene bags, and brought to the laboratory for gamma spectrometry.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

“…The result for A195 means that the upper layer of sediment with high 137 Cs and 134 Cs activities that was deposited during the 2011 wet season had been removed from the tidal beach by February 2012. February occurs during the dry season when only a small amount of sediment is delivered from the river and erosion by strong waves during the winter monsoon may exceed sedimentation (Tamura et al, 2010).…”

Section: Bothmentioning

confidence: 99%

Sediment erosion revealed by study of Cs isotopes derived from the Fukushima Dai-ichi nuclear power plant accident

et al. 2013

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“…However, little is known about the dynamics of the suspended sediment, including spatial and temporal variation of erosion/deposition and transport in the complex channel network of the LMD, Ngoc et al [1], Hung et al [8]. A number of recent studies provided some information on sediment deposition and erosion indicated major factors that influence sediment transport in the LMD, Wolanski et al [9] [10], Tamura et al [11], Mikhailov and Arakelyants [12], Hung et al [7] [8] [13], Ngoc et al [1], Thanh Letrung et al [3] and Manh et al [14] [15].…”

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confidence: 99%

Assessing the Effects of Upstream Dam Developments on Sediment Distribution in the Lower Mekong Delta, Vietnam

Ngoc¹

2017

JWARP

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The Lower Mekong Delta in Vietnam experiences widespread flooding annually. About 17 million people live in the Delta with agriculture as the major economic activity. The suspended sediment load in the Mekong River plays an important role in carrying contaminants and nutrients to the delta and changing the geomorphology of the delta river system. In recent decades, it is generally perceived that the flow and sediment transport in the Mekong River have changed due to climate change and development activities, but observed sediment data are lacking. Moreover, after natural floodplains, the sediment deposition has replaced by dense river systems as resulting in floodplain compartments protected by embankments. This study is aimed to investigate impacts of changing water flow on erosion/deposition in the Lower Mekong Delta. We used Mike 11 hydrodynamic model and sediment transport model for simulating the flow and sediment transport. Various scenarios were simulated based on anticipated upstream discharges. Our findings provide the positive and negative impacts to the changes in sediment transport on agriculture cultivation in the Lower Mekong Delta.

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Monsoon-influenced variations in morphology and sediment of a mesotidal beach on the Mekong River delta coast

Cited by 94 publications

References 27 publications

Large-scale suspended sediment transport and sediment deposition in the Mekong Delta

Large-scale suspended sediment transport and sediment deposition in the Mekong Delta

Sediment erosion revealed by study of Cs isotopes derived from the Fukushima Dai-ichi nuclear power plant accident

Assessing the Effects of Upstream Dam Developments on Sediment Distribution in the Lower Mekong Delta, Vietnam

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