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Effects of riverbed incision on the hydrology of the Vietnamese Mekong Delta
Hydrological Processes ( IF 2.8 ) Pub Date : 2021-01-02 , DOI: 10.1002/hyp.14030
Binh Van Doan 1, 2 , Sameh Kantoush 1 , Tetsuya Sumi 1 , Nguyen Phuong Mai 3 , Ngoc Anh Trieu 2 , Trung Vinh La 4 , An Dang Tran 2
Affiliation  

The hydrogeomorphology of the Vietnamese Mekong Delta (VMD) has been significantly altered by natural and anthropogenic drivers. In this study, the spatiotemporal changes of the flow regime were examined by analysing the long‐term daily, monthly, annual and extreme discharges and water levels from 1980 to 2018, supported by further investigation of the long‐term annual sediment load (from the 1960s to 2015), river bathymetric data (in 1998, 2014 and 2017) and daily salinity concentration (from the 1990s to 2015) using various statistical methods and a coupled numerical model. Then, the effects of riverbed incision on the hydrology were investigated. The results show that the dry season discharge (i.e., in March–June) of the Tien River increased by up to 23% from the predam period (1980–1992) to the postdam period (1993–2018) but that the dry season water level at My Thuan decreased by up to −46%. The annual mean and monthly water levels in June at Tan Chau and in January and June–October at My Thuan in the Tien River decreased statistically, even though the respective discharges increased significantly. These decreased water levels instead of the increased discharges were attributed to the accelerated riverbed incision upstream from My Thuan, which increased by more than three times, from a mean rate of −0.16 m/year (−16.7 Mm3/year) in 1998–2014 to −0.5 m/year (−52.5 Mm3/year) in 2014–2017. This accelerated riverbed incision was likely caused by the reduction in the sediment load of the VMD (from 166.7 Mt/year in the predam period to 57.6 Mt/year in the postdam period) and increase in sand mining (from 3.9 Mm3 in 2012 to 13.43 Mm3 in 2018). Collectively, the decreased dry season water level in the Tien River is likely one of the main causes of the enhanced salinity intrusion.

中文翻译:

河床切口对越南湄公河三角洲水文的影响

越南湄公河三角洲(VMD)的水文地貌已被自然和人为驱动因素显着改变。在这项研究中,通过对1980年至2018年的长期日,月,年和极端排放量和水位进行分析,并在长期年沉积物长期负荷进一步调查的支持下,研究了流域的时空变化。 1960年代至2015年),河流测深数据(1998年,2014年和2017年)和日盐度浓度(1990年代至2015年),采用了各种统计方法和耦合数值模型。然后,研究了河床切口对水文的影响。结果表明,旱季排放量(即 从坝前期(1980-1992年)到坝后期(1993-2018年),天河的3月至6月)增加了高达23%,但My Thuan的旱季水位下降了−46% 。尽管各自的排放量显着增加,但在Tan Chau的6月以及在Tien River的My Thuan的1月和6月至10月的年平均水位和月度水位都有统计学上的下降。这些水位的下降而不是流量的增加是由于My Thuan上游河床切口加速造成的,其增加了三倍以上,平均速率为-0.16 m /年(-16.7 Mm 即使各自的放电显着增加。这些水位的下降而不是流量的增加是由于My Thuan上游河床切口加速造成的,其增加了三倍以上,平均速率为-0.16 m /年(-16.7 Mm 即使各自的排放量明显增加。这些水位的下降而不是流量的增加是由于My Thuan上游河床切口加速造成的,其增加了三倍以上,平均速率为-0.16 m /年(-16.7 Mm3个/年)从1998 -2014年增加到-0.5 m /年(-52.5 Mm 3 /年)。加速河床切割的原因可能是VMD的泥沙量减少(从坝前时期的166.7吨/年降低到坝后时期的57.6吨/年)和采砂量的增加(从2012年的3.9 Mm 3 13.43 Mm 3 in 2018)。总体而言,田河干旱季节的水位下降很可能是盐分入侵加剧的主要原因之一。
更新日期:2021-02-19
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