Details
| Original language | English |
|---|---|
| Article number | 2204 |
| Journal | Water (Switzerland) |
| Volume | 12 |
| Issue number | 8 |
| Publication status | Published - 5 Aug 2020 |
Abstract
The hydro-and morphodynamic processes within the Vietnamese Mekong Delta are heavily impacted by human activity, which in turn affects the livelihood of millions of people. The main drivers that could impact future developments within the delta are local stressors like hydropower development and sand mining, but also global challenges like climate change and relative sea level rise. Within this study, a hydro-morphodynamic model was developed, which focused on a stretch of the Tien River and was nested into a well-calibrated model of the delta's hydrodynamics. Multiple scenarios were developed in order to assess the projected impacts of the different drivers on the river's morphodynamics. Simulations were carried out for a baseline scenario (2000-2010) and for a set of plausible scenarios for a future period (2050-2060). The results for the baseline scenario indicate that the Tien River is already subject to substantial erosion under present-day conditions. For the future period, hydropower development has the highest impact on the local erosion and deposition budget, thus amplifying erosional processes, followed by an increase in sand mining activity and climate change-related variations in discharge. The results also indicate that relative sea level rise only has a minimal impact on the local morphodynamics of this river stretch, while erosional tendencies are slowed by a complete prohibition of sand mining activity. In the future, an unfavourable combination of drivers could increase the local imbalance between erosion and deposition by up to 89%, while the bed level could be incised by an additional 146%.
Keywords
- Climate change, Dam impacts, Mekong, Numerical modelling, River morphology, Sand mining, Sea level rise
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
- Social Sciences(all)
- Geography, Planning and Development
- Agricultural and Biological Sciences(all)
- Aquatic Science
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
Sustainable Development Goals
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In: Water (Switzerland), Vol. 12, No. 8, 2204, 05.08.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Impacts of human activity and global changes on future morphodynamics within the tien river, vietnamese mekong delta
AU - Jordan, C.
AU - Visscher, J.
AU - Dung, N.V.
AU - Apel, H.
AU - Schlurmann, T.
N1 - Funding details: Gottfried Wilhelm Leibniz Universität Hannover, LUH Funding details: Bundesministerium für Bildung und Forschung, BMBF, 02WM1338D Within the framework of the research project Catch-Mekong (https://catchmekong.eoc.dlr.de), this research was funded by the German Ministry of Education and Research (BMBF) under grant number 02WM1338D. The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover.
PY - 2020/8/5
Y1 - 2020/8/5
N2 - The hydro-and morphodynamic processes within the Vietnamese Mekong Delta are heavily impacted by human activity, which in turn affects the livelihood of millions of people. The main drivers that could impact future developments within the delta are local stressors like hydropower development and sand mining, but also global challenges like climate change and relative sea level rise. Within this study, a hydro-morphodynamic model was developed, which focused on a stretch of the Tien River and was nested into a well-calibrated model of the delta's hydrodynamics. Multiple scenarios were developed in order to assess the projected impacts of the different drivers on the river's morphodynamics. Simulations were carried out for a baseline scenario (2000-2010) and for a set of plausible scenarios for a future period (2050-2060). The results for the baseline scenario indicate that the Tien River is already subject to substantial erosion under present-day conditions. For the future period, hydropower development has the highest impact on the local erosion and deposition budget, thus amplifying erosional processes, followed by an increase in sand mining activity and climate change-related variations in discharge. The results also indicate that relative sea level rise only has a minimal impact on the local morphodynamics of this river stretch, while erosional tendencies are slowed by a complete prohibition of sand mining activity. In the future, an unfavourable combination of drivers could increase the local imbalance between erosion and deposition by up to 89%, while the bed level could be incised by an additional 146%.
AB - The hydro-and morphodynamic processes within the Vietnamese Mekong Delta are heavily impacted by human activity, which in turn affects the livelihood of millions of people. The main drivers that could impact future developments within the delta are local stressors like hydropower development and sand mining, but also global challenges like climate change and relative sea level rise. Within this study, a hydro-morphodynamic model was developed, which focused on a stretch of the Tien River and was nested into a well-calibrated model of the delta's hydrodynamics. Multiple scenarios were developed in order to assess the projected impacts of the different drivers on the river's morphodynamics. Simulations were carried out for a baseline scenario (2000-2010) and for a set of plausible scenarios for a future period (2050-2060). The results for the baseline scenario indicate that the Tien River is already subject to substantial erosion under present-day conditions. For the future period, hydropower development has the highest impact on the local erosion and deposition budget, thus amplifying erosional processes, followed by an increase in sand mining activity and climate change-related variations in discharge. The results also indicate that relative sea level rise only has a minimal impact on the local morphodynamics of this river stretch, while erosional tendencies are slowed by a complete prohibition of sand mining activity. In the future, an unfavourable combination of drivers could increase the local imbalance between erosion and deposition by up to 89%, while the bed level could be incised by an additional 146%.
KW - Climate change
KW - Dam impacts
KW - Mekong
KW - Numerical modelling
KW - River morphology
KW - Sand mining
KW - Sea level rise
KW - Budget control
KW - Deposition
KW - Erosion
KW - Hydroelectric power
KW - Hydroelectric power plants
KW - Rivers
KW - Sea level
KW - Erosion and deposition
KW - Erosional process
KW - Global challenges
KW - Hydro-power development
KW - Morphodynamic modeling
KW - Morphodynamic process
KW - Relative sea level rise
KW - Sand mining activities
KW - climate change
KW - future prospect
KW - human activity
KW - hydrodynamics
KW - morphodynamics
KW - river water
KW - Mekong Delta
KW - Viet Nam
KW - Climate change
KW - Dam impacts
KW - Mekong
KW - Numerical modelling
KW - River morphology
KW - Sand mining
KW - Sea level rise
UR - http://www.scopus.com/inward/record.url?scp=85090034760&partnerID=8YFLogxK
U2 - 10.3390/w12082204
DO - 10.3390/w12082204
M3 - Article
VL - 12
JO - Water (Switzerland)
JF - Water (Switzerland)
SN - 2073-4441
IS - 8
M1 - 2204
ER -