On the Control of Saltwater Intrusion: A Case Study for Binh Thuan Province, Vietnam

Quang, Dinh Nhat; Ngan, Vu Huong; Tri, Mai Cao; Cong, Mai Van

doi:10.1007/978-981-15-0291-0_198

Cited by 2 publications

(5 citation statements)

References 13 publications

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“…The limit between the two zones is chosen at a distance from the sea of about 7.5 to 8 km (Figure 1). This distance corresponds to the upstream saltwater intrusion limit in the river estuary during high tide [35]. The vertical axis on the figure always refers to the elevation expressed in m above sea level.…”

Section: Resultsmentioning

confidence: 99%

“…Two disconnected zones along the river were detected (Figure 1) so that the river was identified as the main source for SI [34]. However, a recent study estimated that seawater could penetrate about 7 km inland from the sea during the highest tide [35]. This could not explain the presence of saltwater as far as 15 km from the sea and the occurrence of several saline zones apparently disconnected from each other.…”

Section: Geology and Hydrogeology Of The Study Sitementioning

confidence: 99%

“…These Holocene and Pleistocene sediment sequences also correspond to the unconsolidated aquifers constituting the main groundwater resource in the area. The Holocene aquifers (Q 2 1−2 , Q 2 2 , and Q 2 2−3 , Figure 2b) have a thickness varying from 2 m to 20 m on the left bank and increasing towards the sea [16,27,35]. However, they are considered to be totally or partly absent on the right bank because of strong erosion and uplift processes [16,34,42,43].…”

Section: Data Acquisitionmentioning

confidence: 99%

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Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography

Cong-Thi

Dieu

Thibaut

et al. 2021

Water

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With the growing population and the adverse effects of climate change, the pressure on coastal aquifers is increasing, leading to a larger risk of saltwater intrusion (SI). SI is often complex and difficult to characterize from well data only. In this context, electrical resistivity tomography (ERT) can provide high-resolution qualitative information on the lateral and vertical distribution of salinity. However, the quantitative interpretation of ERT remains difficult because of the uncertainty of petrophysical relationships, the limitations of inversion, and the heterogeneity of aquifers. In this contribution, we propose a methodology for the semiquantitative interpretation of ERT when colocated well data are not available. We first use existing wells to identify freshwater zones and characterize the resistivity response of clayey deposits. Then, we approximate the formation factor from water samples collected in the vicinity of ERT data to derive a resistivity threshold to interpret the saline boundary. We applied the methodology in the shallow aquifers of the Luy River in the Binh Thuan province, Vietnam, where water resources are under pressure due to agricultural, aquacultural, and industrial production. Twenty-one ERT profiles were collected and revealed a much larger intrusion zone, compared to the previous study. Saltwater is present in lowland areas of the left bank over almost the whole thickness of the aquifer, while the right bank is constituted of sand dunes that are filled with freshwater. At a larger distance from the sea, a complex distribution between fresh and saltwater is observed. Our methodology could be applied to other heterogeneous aquifers in the absence of a dense monitoring network.

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Section: Resultsmentioning

confidence: 99%

Section: Geology and Hydrogeology Of The Study Sitementioning

confidence: 99%

Section: Data Acquisitionmentioning

confidence: 99%

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Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography

Cong-Thi

Dieu

Thibaut

et al. 2021

Water

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“…In order to estimate the natural hydrological processes in the study area, hydrological model with Rainfall-Runoff (RR) module was applied by using meteohydrological and topography [11]. Based on hydraulic works and hydrological model results, hydraulic model with Hydrodynamic (HD) module was required to form a basis of unsteady flow in the river system [1]. Calibration and validation were necessarily conducted for both hydrological and hydraulic models.…”

Section: Methodology and Models' Developmentmentioning

confidence: 99%

“…Saltwater intrusion becomes controversial since it has detrimental influences on coastal habitats and human communities [1]. Many pieces of research are implemented to investigate the mechanism and process of this issue.…”

Section: Introductionmentioning

confidence: 99%

Investigation of saltwater intrusion in thach han river system by mike hydro river package

Tai¹,

Khanh²,

Huong³

et al. 2021

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Saltwater intrusion is one of the most severe problems for worldwide coastal regions, leading to negative impacts on both human and aquatic inhabitant communities. Quang Tri province, located in the Central Coast region of Vietnam, faces consequences of saltwater intrusion because of its dense river network and El Nino phenomena’s influences. To analyse hydrological, hydraulic processes as well as investigate saltwater intrusion’s situation in this province, the authors adopted MIKE HYDRO River package and obtained results with good agreements with measured data from survey campaigns. The present conditions scenario shows that saltwater intrudes Thach Han and Cam Lo rivers with a distance of 25.35 km and 15.04 km respectively, where the salt concentration is under 0.75‰ and water can be drunk and irrigated. The large discharge of 30 m3/s can only push saltwater only 1.85 km to the sea, which is insignificant in comparison with the value of seawater wedge length, saltwater intrusion in Thach Han river system can only be mitigated slightly. Since the authors only consider hydrological droughts, future scenarios in 2030 and 2050 have slight differences with the present, where topography and river flow remain unchanged. Based on the above results, non-structural measurements are not recommended to deal with saltwater intrusion for both present and future scenarios, and local authorities should consider structural solutions, e.g. constructions of anti-salt dams, during the decision-making process.

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On the Control of Saltwater Intrusion: A Case Study for Binh Thuan Province, Vietnam

Cited by 2 publications

References 13 publications

Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography

Imaging the Structure and the Saltwater Intrusion Extent of the Luy River Coastal Aquifer (Binh Thuan, Vietnam) Using Electrical Resistivity Tomography

Investigation of saltwater intrusion in thach han river system by mike hydro river package

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