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首页> 外文期刊>Hydrology and Earth System Sciences >Assessment of spatial and temporal patterns of green and blue water flows under natural conditions in inland river basins in Northwest China
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Assessment of spatial and temporal patterns of green and blue water flows under natural conditions in inland river basins in Northwest China

机译：西北内陆河流域自然条件下绿水和蓝水流动的时空格局评价

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In arid and semi-arid regions freshwater resources have become scarcer withincreasing demands from socio-economic development and population growth.Until recently, water research and management has mainly focused on bluewater but ignored green water. Furthermore, in data poor regionshydrological flows under natural conditions are poorly characterised but area prerequisite to inform future water resources management. Here we reporton spatial and temporal patterns of both blue and green water flows that canbe expected under natural conditions as simulated by the Soil and WaterAssessment Tool (SWAT) for the Heihe river basin, the second largest inlandriver basin in Northwest China. Calibration and validation at twohydrological stations show good performance of the SWAT model in modellinghydrological processes. The total green and blue water flows were 22.05–25.51 billion m3 in the 2000s for the Heihe river basin. Blue waterflows are larger in upstream sub-basins than in downstream sub-basins mainlydue to high precipitation and a large amount of snow and melting water inupstream. Green water flows are distributed more homogeneously amongdifferent sub-basins. The green water coefficient was 87%–89% in the2000s for the entire river basin, varying from around 80%–90% in up-and mid-stream sub-basins to above 90% in downstream sub-basins. This ismuch higher than reported green water coefficients in many other riverbasins. The spatial patterns of green water coefficients were closely linkedto dominant land covers (e.g. snow cover upstream and desert downstream) andclimate conditions (e.g. high precipitation upstream and low precipitationdownstream). There are no clear consistent historical trends of change ingreen and blue water flows and the green water coefficient at both the riverbasin and sub-basin levels. This study provides insights into green and bluewater endowments under natural conditions for the entire Heihe river basinat the sub-basin level. The results are helpful to benchmark the natural flowsof water in the basin as part of improved water resources management in theinland river basins of China.
机译：在干旱和半干旱地区，随着社会经济发展和人口增长的不断增长的需求，淡水资源变得越来越稀缺。直到最近，水的研究和管理主要集中在蓝色水上，而忽略了绿色水。此外，在数据贫乏的地区，自然条件下的水文流量特征不清，但该地区是通知未来水资源管理的先决条件。在这里，我们报告了在自然条件下可以预期的蓝色和绿色水流的时空格局，这是通过中国西北第二大内陆驱动器盆地黑河流域的水土评估工具（SWAT）模拟得出的。在两个水文站的校准和验证表明，SWAT模型在模拟水文过程中表现良好。黑河流域的绿色和蓝色水总量在2000年代为22.05–255.1亿m 3 。上游子流域的蓝色水流量大于下游子流域的水流量，主要是由于高降水量以及上游大量积雪和融化水。绿水流量在不同的流域之间更均匀地分布。整个流域在2000年代的绿水系数为87％至89％，从上游和中游子流域的80％至90％到下游子流域的90％以上。这远远高于其他许多流域报道的绿水系数。绿水系数的空间格局与主要的土地覆盖物（例如上游的积雪和下游的沙漠）以及气候条件（例如上游的高降水量和下游的低降水量）密切相关。在河流流域和次流域水平上，绿色和蓝色水流量以及绿色水系数的变化没有明确一致的历史趋势。这项研究为整个黑河流域次流域水平的自然条件下的绿色和蓝色水end赋提供了见识。这些结果有助于基准流域的自然水流，作为改进中国内陆河流域水资源管理的一部分。

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