Salinity Intrusion Trends under the Impacts of Upstream Discharge and Sea Level Rise along the Co Chien River and Hau River in the Vietnamese Mekong Delta

Thanh, Tuu Nguyen; Van, Hiep Huynh; Minh, Hoang Vo; Trí, Văn Phạm Đăng

doi:10.3390/cli11030066

Cited by 7 publications

(2 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There exists a vast body of literature on the situation in the Mekong Delta and on possibilities to improve it (for recent contributions see e.g. Eslami et al., 2021; Kaveney et al., 2023; Thanh et al., 2023). Also several Contingent Valuation studies to assess people's WTP for specific environmental improvements in the Delta like, for example groundwater protection (Vo & Khai, 2017), improvement of surface water quality (Khai, 2014), biodiversity protection (Khai & Yabe, 2014), reduction of risks from salinity intrusion (Khong et al., 2018) etc.…”

Section: Introductionmentioning

confidence: 99%

Saving the Vietnamese Mekong River Delta—People's attitudes, opinions and willingness to help

Ahlheim,

Vuong

2023

J Agronomy Crop Science

View full text Add to dashboard Cite

The unique nature and environment of the Vietnamese Mekong Delta as well as its agricultural production and its traditional lifestyle are endangered by a rising sea level and increasing salinization of the ground and surface water. This paper aims at the assessment of Vietnamese people's information on and attitudes towards these problems as well as their respective convictions and beliefs. Imbedded in an online survey with 2000 completed interviews we also conducted a Contingent Valuation study with which we want to assess people's willingness to contribute personally and financially to saving the Mekong Delta as an indication of the benefits they would expect from such a project. We interviewed three different groups of respondents, one of which lives directly in the Mekong Delta, a second lives outside the Delta, but close to it, that is in Ho Chi Minh City, and the third group lives far away from the Delta in Hanoi. With these three subsamples of respondents we wanted to capture not only the use benefits but also the nonuse benefits accruing from such a project. In the course of the interviews, we found that the Mekong Delta is of great interest and importance to all interviewees, no matter in which part of Vietnam they live. They were mostly well informed on the problems there and had strong opinions on the causes of these problems as well as on suitable strategies to fight them. In our Contingent Valuation study, we assessed the willingness of people at the different study sites to contribute financially to a hypothetical project for the preservation of the Mekong Delta and the socio‐economic, attitudinal and psychological determinants of this willingness. Besides these empirical findings, we also obtained valuable insights regarding various methodological aspects of Contingent Valuation studies.

show abstract

Section: Introductionmentioning

confidence: 99%

Saving the Vietnamese Mekong River Delta—People's attitudes, opinions and willingness to help

Ahlheim,

Vuong

2023

J Agronomy Crop Science

View full text Add to dashboard Cite

show abstract

“…The salinity intrusion rapidly expanded landward and caused significant damage throughout 13 coastal provinces of the VMD, even worse than a historic salinity intrusion in 1998. Moreover, hydroelectric-dam construction in the upper Mekong River has directly affected the hydrological systems, leading to severe impacts on agriculture, aquaculture, and ecology in the VMD [14][15][16][17][18][19]. Thus, water management and adaptive water governance play a key role in all activities in the VMD to guarantee safe and sustainable development in the future [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Surface Water Mapping and Flood Monitoring in the Mekong Delta Using Sentinel-1 SAR Time Series and Otsu Threshold

Tran

Menenti

2022

Remote Sensing

View full text Add to dashboard Cite

The annual flood and the alteration in hydrological regimes are the most vital concerns in the Vietnamese Mekong Delta (VMD). Although synthetic aperture radar (SAR) Sentinel-1 imagery is widely used for water management, only a few studies have used Sentinel-1 data for mapping surface water and monitoring flood events in the VMD. This study developed an algorithm to implement (i) automatic Otsu threshold on a series of Sentinel-1 images to extract surface water and (ii) time series analyses on the derived surface water maps to detect flood water extent in near-real-time (NRT). Specifically, only cross-polarized VH was selected after an assessment of different Sentinel-1 polarizations. The dynamic Otsu thresholding algorithm was applied to identify an optimal threshold for each pre-processed Sentinel-1 VH image to separate water from non-water pixels for producing a time series of surface water maps. The derived Sentinel-1 surface water maps were visually compared with the Sentinel-2 Full Resolution Browse (FRB) and statistically examined with the Sentinel-2 Multispectral Instrument (MSI) surface water maps, which were generated by applying the Otsu threshold on the normalized difference water index (NDWI) and modified normalized difference water index (MNDWI) images. The visual comparison showed a strong correspondence between the Sentinel-1 surface water maps and Sentinel-2 FRB images in three periods, including rice’s sowing season, flood period, and rice’s maturation stage. A good statistical agreement suggested that the performance of the dynamic Otsu thresholding algorithm on Sentinel-1 image time series to map surface water is effective in river areas (R2 = 0.97 and RMSE = 1.18%), while it is somewhat lower in paddy field areas (R2 = 0.88 and RMSE = 3.88%). Afterward, a flood mapping algorithm in NRT was developed by applying the change-detection-based time series analyses on the derived Sentinel-1 surface water maps. Every single pixel at the time is respectively referred to its state in the water/non-water and flooded/non-flooded maps at the previous time to be classified into a flooded or non-flooded pixel. The flood mapping algorithm enables updates at each time step to generate temporal flood maps in NRT for monitoring flood water extent in large-scale areas. This study provides a tool to rapidly generate surface water and flood maps to support water management and risk reduction in the VMD. The future improvement of the current algorithm is discussed.

show abstract

Mekong River Delta

Van,

Mei,

Mai

2024

Delta Sustainability

View full text Add to dashboard Cite

Salinity Intrusion Trends under the Impacts of Upstream Discharge and Sea Level Rise along the Co Chien River and Hau River in the Vietnamese Mekong Delta

Cited by 7 publications

References 89 publications

Saving the Vietnamese Mekong River Delta—People's attitudes, opinions and willingness to help

Saving the Vietnamese Mekong River Delta—People's attitudes, opinions and willingness to help

Surface Water Mapping and Flood Monitoring in the Mekong Delta Using Sentinel-1 SAR Time Series and Otsu Threshold

Mekong River Delta

Contact Info

Product

Resources

About