INVESTIGATING DRIVERS OF EROSION IN A TECTONICALLY-QUIESCENT MONSOONAL RIVER BASIN, SONG GIANH, CENTRAL VIETNAM

2017 ◽  
Author(s):  
Tara N. Jonell ◽  
◽  
Peter D. Clift ◽  
Long V. Hoang ◽  
Tina Hoang ◽  
...  
Keyword(s):  
River Basin ◽  
Central Vietnam

scholarly journals Quantifying human impacts on hydrological drought using a combined modelling approach in a tropical river basin in central Vietnam

2018 ◽  
Vol 22 (1) ◽  
pp. 547-565 ◽  
Author(s):  
A. B. M. Firoz ◽  
Alexandra Nauditt ◽  
Manfred Fink ◽  
Lars Ribbe
Keyword(s):  
River Basin ◽  
Reservoir Operation ◽  
Human Impacts ◽  
Hydrological Drought ◽  
Drought Risk ◽  
Climatic Data ◽  
Strong Impact ◽  
Hydropower Development ◽  
Drought Duration ◽  
Central Vietnam

Abstract. Hydrological droughts are one of the most damaging disasters in terms of economic loss in central Vietnam and other regions of South-east Asia, severely affecting agricultural production and drinking water supply. Their increasing frequency and severity can be attributed to extended dry spells and increasing water abstractions for e.g. irrigation and hydropower development to meet the demand of dynamic socioeconomic development. Based on hydro-climatic data for the period from 1980 to 2013 and reservoir operation data, the impacts of recent hydropower development and other alterations of the hydrological network on downstream streamflow and drought risk were assessed for a mesoscale basin of steep topography in central Vietnam, the Vu Gia Thu Bon (VGTB) River basin. The Just Another Modelling System (JAMS)/J2000 was calibrated for the VGTB River basin to simulate reservoir inflow and the naturalized discharge time series for the downstream gauging stations. The HEC-ResSim reservoir operation model simulated reservoir outflow from eight major hydropower stations as well as the reconstructed streamflow for the main river branches Vu Gia and Thu Bon. Drought duration, severity, and frequency were analysed for different timescales for the naturalized and reconstructed streamflow by applying the daily varying threshold method. Efficiency statistics for both models show good results. A strong impact of reservoir operation on downstream discharge at the daily, monthly, seasonal, and annual scales was detected for four discharge stations relevant for downstream water allocation. We found a stronger hydrological drought risk for the Vu Gia river supplying water to the city of Da Nang and large irrigation systems especially in the dry season. We conclude that the calibrated model set-up provides a valuable tool to quantify the different origins of drought to support cross-sectorial water management and planning in a suitable way to be transferred to similar river basins.

Speolabeo hokhanhi, a new cavefish from Central Vietnam (Teleostei: Cyprinidae)

Zootaxa ◽  
2018 ◽  
Vol 4476 (1) ◽  
pp. 109 ◽  
Author(s):  
NGUYEN DINH TAO ◽  
LIANG CAO ◽  
SHUQING DENG ◽  
E ZHANG
Keyword(s):  
New Species ◽  
River Basin ◽  
National Park ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Lower Lip ◽  
Central Vietnam ◽  
Peduncle Length ◽  
Pelvic Fin

Speolabeo hokhanhi, new species, is here described from Hang Va Cave in Phong Nha-Ke Bang National Park (Son River basin) in Central Vietnam. It can be distinguished from S. musaei by having no papillae on the lower lip, no hump immediately behind the head, a duckbilled snout, a shorter caudal peduncle (length 16.8–18.6% SL), and the pelvic fin inserted closer to the snout tip than to the caudal-fin base.

scholarly journals Assessment the impacts of climate change on drought in the Ba River basin, Central Vietnam using Landsat remote sensing data

2022 ◽  
Vol 964 (1) ◽  
pp. 012006
Author(s):  
Han T N Tham ◽  
Thy T M Pham ◽  
Thi N K Truong ◽  
Huong T T Nguyen ◽  
Nguyen D Lam ◽  
...  
Keyword(s):  
Climate Change ◽  
Remote Sensing ◽  
River Basin ◽  
El Niño ◽  
Agricultural Land ◽  
El Nino ◽  
Sharp Decrease ◽  
Forest Area ◽  
Central Vietnam ◽  
Impacts Of Climate Change

Abstract Sustainable management of the river basin is a profound challenge for environmental management in the context of climate change. Drought situations in a basin occur in relation to meteorological, hydrological, agricultural factors and climate change as well. In this study, remote sensing technology was applied to assess the impacts of climate change on drought in the Ba River basin, Central Vietnam. Drought in the basin has been created by land use/land cover changes in recent years, which has resulted in a sharp decrease in forest area in the period 1989 to 2019 (-41.5%) and a significant increase of agricultural land with 38.2%. Following that, the area of drought agriculture rose by 28.8%. The remarkably high drought areas in agricultural land were in El Nino years, 2016 (99.2%) and 2019 (87.3%), which indicated that under climate change impacts, a drought occurred more severely. Moreover, drought also appeared in the forest. The forest area deceased but the drought levels in the forest increased slightly since 2005 and hit a peak drought value in 2016 with 97.0% of forest area. During El Niño years, the precipitation, atmospheric moisture, and water flow in the basin were all lower than in previous years.

scholarly journals Cropping systems in the Vu Gia Thu Bon river basin, Central Vietnam: On farmers’ stubborn persistence in predominantly cultivating rice

2017 ◽  
Vol 80 ◽  
pp. 1-13 ◽  
Author(s):  
Rui Pedroso ◽  
Dang Hoa Tran ◽  
Minh Hoa Nguyen Thi ◽  
An Van Le ◽  
Lars Ribbe ◽  
...  
Keyword(s):  
River Basin ◽  
Cropping Systems ◽  
Central Vietnam

scholarly journals Quantifying human impacts on hydrological drought using a combined modelling approach in a tropical river basin in Central Vietnam

2017 ◽  
Author(s):  
A. B. M Firoz ◽  
Alexandra Nauditt ◽  
Manfred Fink ◽  
Lars Ribbe
Keyword(s):  
River Basin ◽  
Reservoir Operation ◽  
Human Impacts ◽  
Hydrological Drought ◽  
Drought Risk ◽  
Climatic Data ◽  
Strong Impact ◽  
Hydropower Development ◽  
Drought Duration ◽  
Central Vietnam

Abstract. Hydrological droughts are one of the most damaging disasters in terms of economic loss in Central Vietnam and other regions of South East Asia severely affecting agricultural production and drinking water supply. Their increasing frequency and severity can be attributed to extended dry spells and increasing water abstractions for e.g. irrigation and hydropower development to meet the demand of dynamic socioeconomic development. Based on hydro-climatic data for the period from 1980 to 2013 and reservoir operation data, the impacts of recent hydropower development and other alterations of the hydrological network on downstream streamflow and drought risk were assessed for a mesoscale basin of steep topography in Central Vietnam, the Vu Gia Thu Bon (VGTB) river basin. The Just Another Modelling System (JAMS)/J2000 was calibrated for the VGTB river basin to simulate reservoir inflow and the naturalized discharge time series for the downstream gauging stations. The HEC-ResSim reservoir operation model simulated reservoir outflow from eight major hydropower stations as well as the reconstructed streamflow for the main river branches Vu Gia and Thu Bon. Drought duration, severity and frequency was analysed for different time scales for the naturalized and reconstructed streamflow by applying the daily varying threshold method. Efficiency statistics for both models show good results. A strong impact of reservoir operation on downstream discharge at the daily, monthly, seasonal and annual scale was detected for four discharge stations relevant for downstream water allocation. In accordance with the reports from local stakeholders, we found a stronger hydrological drought risk for the anthropogenically impacted reconstructed streamflow. We conclude that the calibrated model setup provides a valuable tool to quantify the different origins of drought to support cross-sectorial water management and planning in a suitable way to be transferred to similar river basins.

Technical efficiency of rice production in the delta of the Vu Gia Thu Bon river basin, Central Vietnam

2018 ◽  
Vol 9 ◽  
pp. 18-26 ◽  
Author(s):  
Rui Pedroso ◽  
Dang Hoa Tran ◽  
Trinh Quoc Viet ◽  
An Van Le ◽  
Khoa Tran Dang ◽  
...  
Keyword(s):  
Technical Efficiency ◽  
River Basin ◽  
Rice Production ◽  
Central Vietnam
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