Identifying hydrologic reference stations to understand changes in water resources across Vietnam - a data-driven approach

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY VIETNAM JOURNAL OF EARTH SCIENCES Pub Date : 2022-03-11 DOI:10.15625/2615-9783/16980
Hong Xuan Do, Manh -Hung Le, Hung Thanh Pham, Tu Hoang Le, Binh Quang Nguyen
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引用次数: 6

Abstract

Among the impacts of climate change and variabilities, change in the terrestrial water cycle has been investigated extensively due to the importance of water resources to the Earth System. The detection and attribution of changes in river flows, however, are usually complicated by the impacts of on-ground human activities such as urbanization or dam construction that have altered flow regimes. As a result, hydrological reference stations – gauges measuring river flows of catchments that are unregulated - have been identified in many countries to provide streamflow records that are suitable for climate studies. Such a network, to the best of our knowledge, has not been promoted widely in Vietnam, making it difficult to determine the actual impact of climate change and variability to river flow regimes at the national scale. To address this limitation, this study uses a data-driven approach to identify stations that have not been influenced substantially by human activities for Vietnam. Specifically, we have carefully assessed streamflow records at 68 locations that are not influenced by tidal regime to identify stations with relatively good data quality. The drainage area associated with each of these stations was then delineated following international standards, and then used to identify catchments that were not associated with large dams. The catchment boundary was also used to extract land surface information, available through an ensemble of different satellite-based data products, to further identify catchments that are not featured by large urban areas, or experienced a substantial change in land cover during the 2000-2019 period. Using these criteria, this study suggested two subsets of stations distributed across the countries, providing a good starting point for future investigations into the impacts of climate change on water resources in Vietnam. The investigation also suggests that more investments are required to maintain and expand the hydrologic reference network for Vietnam.
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确定水文参考站以了解越南水资源的变化——一种数据驱动的方法
在气候变化和变率的影响中,由于水资源对地球系统的重要性,陆地水循环的变化得到了广泛的研究。然而,对河流流量变化的探测和归因通常会因人类活动的影响而变得复杂,如城市化或大坝建设等,这些活动改变了河流的流动状况。因此,许多国家已经确定了水文参考站——测量不受管制的集水区河流流量的仪表——以提供适合气候研究的流量记录。据我们所知,这样一个网络还没有在越南得到广泛推广,因此很难确定气候变化和变异对全国范围内河流流量状况的实际影响。为了解决这一限制,本研究使用数据驱动的方法来确定越南未受人类活动重大影响的站点。具体而言,我们仔细评估了68个不受潮汐状况影响的地点的流量记录,以确定数据质量相对较好的站点。然后按照国际标准划定与这些站点相关的排水区域,然后用于确定没有与大型水坝相关的集水区。流域边界还用于提取地表信息,这些信息可通过不同的卫星数据产品集合获得,以进一步确定没有大城市地区特征的流域,或在2000-2019年期间经历了土地覆盖的重大变化。利用这些标准,本研究提出了分布在各国的两个站点子集,为未来研究气候变化对越南水资源的影响提供了一个良好的起点。调查还表明,需要更多的投资来维持和扩大越南的水文参考网络。
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来源期刊
VIETNAM JOURNAL OF EARTH SCIENCES
VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
20.00%
发文量
0
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