River Damming Impacts on Fish Habitat and Associated Conservation Measures

Reviews of Geophysics, Journal Year: 2023, Volume and Issue: 61(4)

Published: Dec. 1, 2023

Abstract River damming has brought great benefits to flood mitigation, energy and food production, will continue play a significant role in global supply, particularly Asia, Africa, South America. However, dams have extensively altered river dynamics, including riverine connectivity, hydrological, thermal, sediment solute regimes, the channel morphology. These alterations detrimental effects on quality quantity of fish habitat associated impacts aquatic life. Indeed, been implicated decline numerous fishes, emphasizing need for effective conservation measures. Here, we present synthesis critical issues concerning physical habitats, with particular focus key species across continents. We also consider current measures their applicability different contexts. Finally, identify future research needs. The information presented herein help support sustainable dam operation under constraints climate change human

Language: Английский

---

Sand mining in the Mekong Delta: Extent and compounded impacts

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 924, P. 171620 - 171620

Published: March 11, 2024

Sand mining has accelerated in recent years primarily due to population increase and rapid urbanization. To meet demand, the rate of sand extraction often exceeds natural replenishment with serious environmental consequences. In this review paper, Vietnamese Mekong Delta (VMD), a global hotspot for prolonged history intensive riverbed extraction, is used as representative case study highlight extent compounded impacts activity. The budget VMD ranged from 8.5 45.7 Mm3/yr. large difference use different methods determine well difficulties associated measuring volume extracted riverbed. Widespread illegal region further exacerbates mismatch. consequences include deeply incised riverbeds that result riverbank coastal erosion. Massive sediment removal also led river water level reductions, disrupted hydrological connectivity, diminished floodplain inundation. addition, augmented backwater effect results lowering, amplifies saltwater intrusion dry season. While physical studied, studies on ecological socio-economic ramifications remain sparse. ways which upstream dams, irrigation infrastructure, excessive groundwater sea-level rise (SLR) have amplified effects was considered review. This paper concludes by advocating adoption remote sensing-based approaches effective mapping activities need mine sustainably balance developmental needs conservation.

Language: Английский

---

Improved trade-offs of hydropower and sand connectivity by strategic dam planning in the Mekong

Nature Sustainability, Journal Year: 2018, Volume and Issue: 1(2), P. 96 - 104

Published: Feb. 7, 2018

Language: Английский

---

The Mekong's future flows under multiple drivers: How climate change, hydropower developments and irrigation expansions drive hydrological changes

The Science of The Total Environment, Journal Year: 2018, Volume and Issue: 649, P. 601 - 609

Published: Aug. 17, 2018

Language: Английский

---

Catchment-scale cumulative impact of human activities on river channels in the late Anthropocene: implications, limitations, prospect

Geomorphology, Journal Year: 2019, Volume and Issue: 338, P. 88 - 104

Published: March 25, 2019

Language: Английский

---

Planning dam portfolios for low sediment trapping shows limits for sustainable hydropower in the Mekong

Science Advances, Journal Year: 2019, Volume and Issue: 5(10)

Published: Oct. 11, 2019

Strategic planning in the Mekong Basin could improve trade-offs between hydropower and sediment supply to Delta.

Language: Английский

---

Groundwater extraction may drown mega-delta: projections of extraction-induced subsidence and elevation of the Mekong delta for the 21st century

Environmental Research Communications, Journal Year: 2019, Volume and Issue: 2(1), P. 011005 - 011005

Published: Dec. 12, 2019

Abstract The low-lying and populous Vietnamese Mekong delta is rapidly losing elevation due to accelerating subsidence rates, primarily caused by increasing groundwater extraction. This strongly increases the delta’s vulnerability flooding, salinization, coastal erosion and, ultimately, threatens its nearly 18 million inhabitants with permanent inundation. We present projections of extraction-induced consequent loss for this century following six mitigation non-mitigation extraction scenarios using a 3D hydrogeological model coupled geotechnical module. Our results reveal long-term physically response aquifer system different pathways show potential recover. When allowed increase continuously, as it did over past decades, has drown single-handedly before end century. quantifications also disclose reduce limiting exploitation hereby future loss. However, window mitigate closing large parts lowly elevated plain may already fall below sea level in coming decades. Failure result mass displacement millions people could severely affect regional food security producing capacity collapse.

Language: Английский

---

Estimation of Soil Erosion and Sediment Yield in the Lancang–Mekong River Using the Modified Revised Universal Soil Loss Equation and GIS Techniques

Water, Journal Year: 2019, Volume and Issue: 12(1), P. 135 - 135

Published: Dec. 31, 2019

The Lancang–Mekong River basin, as an important transboundary river in Southeast Asia, is challenged by rapid socio-economic development, especially the construction of hydropower dams. Furthermore, substantial factors, such terrain, rainfall, soil properties and agricultural activity, affect are highly susceptible to erosion sediment yield. This study aimed estimate average annual terms spatial distribution deposition using revised universal loss equation (RUSLE) GIS techniques. also applied remote sensing available data sources for analysis. Annual most parts area range from 700 10,000 t/km2/y with a mean value 5350 t/km2/y. Approximately 45% total undergoes moderate erosion. Moreover, assessments modified RUSLE techniques indicate high along flow direction mainstream, upper Mekong Delta. northern part central southern lower vulnerable increase rates, indicating deposition.

Language: Английский

---

Impacts of Mainstream Hydropower Dams on Fisheries and Agriculture in Lower Mekong Basin

Sustainability, Journal Year: 2020, Volume and Issue: 12(6), P. 2408 - 2408

Published: March 19, 2020

The riverine ecosystems of the Mekong River Basin possess world’s most productive inland fishery and provide highly food crops for millions people annually. development hydropower potential in has long been interest to governments region. Among existing 64 dams, 46 dams have built Lower (LMB) produce up 8650 MW electricity. Additionally, 123 proposed eleven plants nominated river mainstream are expected install a total 13,000 LMB countries. However, serious concerns intensified over negative economic consequences, especially on fisheries agriculture Cambodia Vietnam. To date, concentrated impacts hydrology, environment, livelihood, diversity attributed development. This paper, however, discusses agricultural sectors focuses downstream floodplains dam construction caused greater losses biodiversity than climate change LMB. reduction 276,847 178,169 t fish, 3.7% 2.3% rice, 21.0% 10.0% maize will contribute decrease 0.3% GDP Vietnam, respectively. Lao PDR may benefit revenue from electricity generation other country LMB, as projected country. burdens 3/4 capture destruction, whilst PDR, Thailand, Vietnam endure remaining 1/3 losses. tradeoff analyses reveal that fisheries, sediment or nutrients, social mitigation costs benefits generation, improved irrigation, flood control socioeconomic environmental damage by developing countries, including Mekong, is early North America Europe. It River, well rivers should be gradually removed shifted toward solar, wind, renewable resources.

Language: Английский

---

Dramatic decrease of flood frequency in the Mekong Delta due to river-bed mining and dyke construction

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 723, P. 138066 - 138066

Published: March 23, 2020

Language: Английский

---