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
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
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DOI：
10.3390/cli11030066
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发表时间：
2023-03
期刊：
影响因子：
3.7
通讯作者：
T. N. Thanh;Hiep Huynh Van;Hoang Vo Minh;V. Tri
中科院分区：
文献类型：
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作者：
T. N. Thanh;Hiep Huynh Van;Hoang Vo Minh;V. Tri
开发了一维水力 HEC-RAS 模型来预测越南茶荣省 Co Chien 河和 Hau 河支流的盐度变化。边界数据包括芹苴和美顺的河流流量、水位和沿海监测站的盐度。选择了Co Chien河和Hau河沿岸的6个监测站来研究盐度变化。基于越南新的气候变化情景和之前的研究，选择了2020-2050年期间的四种情景，包括SLR17、SLR22、SLR26L和SLR26H，对应于旱季海平面上升（17、22和26厘米）和上游河流流量减少（芹苴和美顺分别为100-128%和80-117%）。结果强调，当芹苴和美顺的平均流量减少时，盐度的增加比海平面上升的影响更显着。茶荣省监测站的 Co Chien 河和 Hau 河沿岸盐度预计将分别增加 4-21% 和 3-29%。此外，海平面上升也影响了 Co Chien 河的排放分布。它表明迫切需要提高农民对气候变化适应、生产设备投资以及对湄公河上游河床采矿和活动进行适当监管的意识。
A one-dimensional hydraulic HEC-RAS model was developed to forecast the change in salinity in the tributaries of the Co Chien and Hau Rivers in Tra Vinh province, Vietnam. The boundary data includes river discharge at Can Tho and My Thuan, water levels, and salinity at coastal monitoring stations. Six monitoring stations along the Co Chien River and Hau River were selected to study salinity changes. Four scenarios for the period 2020–2050 were selected, including SLR17, SLR22, SLR26L, and SLR26H, corresponding to sea level rise (17, 22, and 26 cm) and upstream river discharge decrease (in the ranges of 100–128% and 80–117% at Can Tho and My Thuan, respectively) in the dry season based on new climate change scenarios in Vietnam and previous studies. The results highlight that when the average discharge at Can Tho and My Thuan reduces, the salinity increases more significantly than the impact of sea level rise. Salinity at the monitoring stations in Tra Vinh province is projected to increase within the ranges of 4–21% and 3–29% along the Co Chien River and Hau River, respectively. In addition, sea level rise is seen to affect the discharge distribution into the Co Chien River. It suggests an urgent need to raise farmers’ awareness of climate change adaptation, investment in production equipment, and appropriate regulation of riverbed mining and activities upstream in the Mekong River.