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

Ngoc, Trieu Anh

doi:10.4236/jwarp.2017.97055

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…Temporal variation of GWQI suggests that the trend of groundwater quality at eight wells improved from 2009 to 2018 due to less sediment deposition and effective environmental management policies in An Giang. The construction of hydropower plants in the upper Mekong River basin caused a decrease in river discharge and sediment deposition in the study area [48,65]. Ngoc et al [65] predicted the reduction of sediment at Tan Chau station in the future due to the expansion of hydropower plants.…”

Section: Discussionmentioning

confidence: 99%

“…The construction of hydropower plants in the upper Mekong River basin caused a decrease in river discharge and sediment deposition in the study area [48,65]. Ngoc et al [65] predicted the reduction of sediment at Tan Chau station in the future due to the expansion of hydropower plants. Arsenic contaminant is often found as a result of natural conditions and human activities in Asian countries [66].…”

Section: Discussionmentioning

confidence: 99%

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Groundwater Quality Assessment Using Fuzzy-AHP in An Giang Province of Vietnam

et al. 2019

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Along with rapid population growth in Vietnam, there is an increasing dependence on groundwater for various activities. An Giang province is known to be one of the agricultural intensification areas of The Vietnamese Mekong Delta (VMD). This study aimed to evaluate the spatiotemporal variation of groundwater quality for a period of ten years from 2009 to 2018 in An Giang. The weighted groundwater quality index (GWQI) was developed based on the fuzzy analytic hierarchy process (Fuzzy-AHP) for assigning weighted parameters. The results show that that shallow wells in the Northeast and Southeast regions of An Giang were mostly categorized under "bad water" quality with high arsenic (As) concentration over the years partly due to huge amounts of sediment deposition in monsoon season. Overall, the reason for the poor groundwater quality in An Giang was the combined effect of both natural and human activities. On the other hand, we detected high values of GWQI links with high As concentration in areas where people extract more groundwater for irrigation. Temporal variation of GWQI suggested that groundwater quality at eight wells has improved from 2009 to 2018 in the wet season as compared to the dry season. The reason behind the improvement of groundwater quality during wet season was the decrease in river discharge, which causes less deposition of suspended solids near the flood plains. Moreover, the filling of unused wells can reduce the movement of pollutants from unused wells to groundwater aquifers. Although there was not sufficient evidence to show the relationship between As and sediment concentration, the temporal reduction trend in river discharge and suspended solids was detected in An Giang. The understanding of groundwater quality can help policymakers protect and manage limited water resources in the long-term.Geosciences 2019, 9, 330 2 of 23 of usages [6,7]. The disadvantages of the AHP method include the uncertainty and ambiguity in expressing opinions, as the method depends on the decision maker's knowledge and experiences during the decision-making process. Moreover, among other factors, the AHP method does not contain feedback loops [8].The fuzzy set was first developed by Zadeh in 1965 [5] and combined with Saaty's priority theory to reduce human ambiguity [9,10]. Later, the Fuzzy-AHP was further developed in order to overcome the uncertainty and ambiguity of criteria weights in deterministic and inflexible classifications [11]. Using the Fuzzy-AHP can provide a fuzzy number-interval judgment values rather than fixed or exact values [2]. This approach reduces uncertainty in assigned relative weight. As a result, the Fuzzy-AHP has been successfully used in many actual decision situation making such as energy alternatives selection [12,13], supplier selection [14], environmental sustainability evaluation [7], and water quality assessment [15][16][17]. Baghapour et al. [15] conducted the Fuzzy-AHP with fuzzy ordered weighted averaging (FOWA) for developing of the groundwater quality index (GWQI). They...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Groundwater Quality Assessment Using Fuzzy-AHP in An Giang Province of Vietnam

et al. 2019

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“…However, in recent years, there was a decrease in As concentration in groundwater associated with reduced sediment deposition in the Mekong Delta [8]. Young Quaternary deltaic and alluvial sediments can contain As, and the building of hydropower plants in the upper Mekong River has prevented these sediments from flowing down to the lower areas [8,39].…”

Section: General Groundwater Characteristics From 2017 -2020mentioning

confidence: 99%

Application of Integrated-Weight Water Quality Index in Groundwater Quality Evaluation

2022

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Groundwater is one of the most crucial freshwater resources in many parts of the world. However, the growth of the population and different economic activities have negatively impacted groundwater quality. This study aims to assess the groundwater quality in An-Giang province, Vietnam, from 2017–2020 and investigate its suitability for drinking via a new integrated-weight water quality index (IWQI). The samples were collected at thirteen wells in dry and rainy seasons and analyzed for eleven physicochemical parameters, including pH, total dissolved solids (TDS), total hardness, nitrate (NO3ˉ), ammonium (NH4+), iron (Fe), manganese (Mn), arsenic (As), mercury (Hg), lead (Pb), and coliform. These values were compared to the Vietnamese standard. The entropy weight method and the Criteria Importance Though Inter-criteria The correlation weighting method was integrated to compute the weights in IWQI. The results showed that NH4+and coliform concentrations were consecutively higher than the standard over the study period. No detection of As, Hg, and Pb concentrations in groundwater was in 2019 – 2020. There were significant statistical differences between parameters from 2017–2020 in the dry and rainy seasons. The results of IWQI revealed that about 40% of the total samples in 2020 were categorized as unsuitable for drinking. IWQI values range from 72 to 7973 in 2020, 12 to 3020 in 2019, 21 to 1115 in 2018, and 53 to 2246 in 2017. Most samples with high IWQI values are located near the burial pits of African fever-infected swine. The findings of this study could provide further information about the changes in groundwater quality from 2017–2020 in An Giang province, Vietnam, and the IWQI method can be proposed for other studies to evaluate groundwater quality effectively. Doi: 10.28991/CEJ-2022-08-11-020 Full Text: PDF

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“…Their hydrodynamic module is based on the solution of the de Saint-Venant one-dimensional system of equations. Thanks to a large simplification in the description of hydrodynamics, this approach enables modeling long river sections (river system) in a long-term perspective [21]. The construction and calibration of the hydrodynamic model was performed as part of the preliminary analysis of the Lower Vistula Cascade carried out by [7].…”

Section: Bathymetry Changes Without Barrages-scenario S0mentioning

confidence: 99%

Sediment Transport Management Using the Planned Construction of the Lower Vistula Cascade as an Example

et al. 2022

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Construction of the Włocławek Barrage on the Vistula River in 1970 became an important source of energy; however, it discontinued sediment transport in the Vistula River. This phenomenon resulted in accumulation before and erosion below the barrage; a similar problem can be expected due to the planned construction of the Lower Vistula Cascade. This study is dedicated to finding an effective and feasible solution to sediment transport management, acceptable to a wide group of users (e.g., navigation, energy producers, and ecologists). A numerical 1D model was applied to carry out analysis of hydrodynamics and sediment transport in the river section from Włocławek Barrage to the Vistula River mouth in the Baltic Sea. For calibration, historical data describing the accumulation and erosion created by the Włocławek Barrage were used. The proposed model allowed incorporation of new barrages chronologically, in accordance with the proposed time schedules. Analysis was carried out in a 50-year horizon, using a set of historical flow data. For sediment flushing, it was proposed to use natural flooding events exceeding Q10% discharge and to control sediment management of the adjacent barrages. To use this method in practice requires verification.

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

Cited by 10 publications

References 26 publications

Groundwater Quality Assessment Using Fuzzy-AHP in An Giang Province of Vietnam

Groundwater Quality Assessment Using Fuzzy-AHP in An Giang Province of Vietnam

Application of Integrated-Weight Water Quality Index in Groundwater Quality Evaluation

Sediment Transport Management Using the Planned Construction of the Lower Vistula Cascade as an Example

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