大坝水库对红河水系(越南)输沙量变化的长期分析

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2023-10-16 DOI:10.1016/j.jher.2023.10.002
Nguyen Hao Quang , Tran Quoc Viet
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引用次数: 0

摘要

红河水系是越南第二大水系,自大坝和水库建成以来,其泥沙状况发生了变化,对下游河流过程产生了影响。我们分析了在三条主要支流下游的关键测量站收集的日流量和悬沙浓度的长期数据集:大河上的HB、红河(主河道)上的YB、洛河上的VQ和红河系统出口ST。结果表明,正如在四个站点观察到的那样,红河系统输送的年输沙量急剧减少。例如,ST站的输沙量急剧下降了91%,从2009-2011年的117.9×106吨/年下降到1958-1987年的10.5×106吨/年。红河水系的输沙量经历了两次显著下降。第一次下降发生在1988年至2008年,这可归因于华平大坝于1988年开始运行。第二次下降发生在2009年,与新大坝水库的使用相吻合。与此同时,自2008年底以来,所有四个站点的排水量都明显发生了突变。然而,与沉积物预算相比,水排放量的减少并不明显。根据我们的分析,我们得出结论,与气温和降水等气候变化相比,大坝水库的影响对系统的影响更大。
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Long-term analysis of sediment load changes in the Red River system (Vietnam) due to dam-reservoirs

The sediment regime of the Red River system, the second largest in Vietnam, has undergone changes since the implementation of dams and reservoirs, with implications for downstream river processes. We analyzed long-term datasets of daily discharge and suspended sediment concentrations collected at key gauging stations downstream of the three main tributaries: HB on the Da River, YB on the Red River (main channel), VQ on the Lo River, and ST, the outlet of the Red River system. The results indicated a sharp reduction in the annual sediment load transported by the Red River system, as observed at the four stations. For example, at the ST station, there was a dramatic decline of 91% in sediment load, dropping from 117.9 × 106 ton/yr in the period 2009–2021 to 10.5 × 106 ton/yr in the period 1958–1987. The Red River system experienced two notable declines in sediment load. The first decline occurred from 1988 to 2008, which can be attributed to the commencement of Hoa Binh dam's operation in 1988. The second decline has taken place since 2009, coinciding with the utilization of new dam-reservoirs. Meanwhile, an abrupt change in water discharge was observed clearly since the end of 2008 at all four stations. However, the reductions in water discharges were found to be less pronounced when compared to the sediment budget. Based on our analysis, we concluded that the impacts of dam-reservoirs have had a more substantial influence on the system compared to variations in climate, such as air temperature and precipitation.

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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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