Keune J, Miralles D G
Laboratory of Hydrology and Water Management Ghent University Ghent Belgium.
Water Resour Res. 2019 Nov;55(11):9947-9961. doi: 10.1029/2019WR025310. Epub 2019 Nov 28.
Water resources and water scarcity are usually regarded as local aspects for which a watershed-based management appears adequate. However, precipitation, as a main source of freshwater, may depend on moisture supplied through land evaporation from outside the watershed. This notion of evaporation as a local "green water" supply to precipitation is typically not considered in hydrological water assessments. Here we propose the concept of a , which establishes atmospheric pathways and links land surface evaporation as a moisture supply to precipitation, hence contributing to local but also remote freshwater resources. Our results show that up to 74% of summer precipitation over European watersheds depends on moisture supplied from other watersheds, which contradicts the conventional consideration of autarkic watersheds. The proposed network approach illustrates atmospheric pathways and enables the objective assessment of freshwater vulnerability and water scarcity risks under global change. The illustrated watershed interdependence emphasizes the need for global water governance to secure freshwater availability.
水资源和水资源短缺通常被视为局部问题，基于流域的管理似乎足以应对。然而，降水作为淡水的主要来源，可能取决于通过流域外陆地蒸发提供的水分。在水文水资源评估中，通常不考虑这种将蒸发视为降水的局部“绿水”供应的概念。在此，我们提出了一个[具体概念名称缺失]的概念，它建立了大气路径，并将陆地表面蒸发作为水分供应与降水联系起来，从而对本地乃至远程的淡水资源都有贡献。我们的结果表明，欧洲流域夏季降水量的高达74%依赖于其他流域提供的水分，这与自给自足流域的传统观念相矛盾。所提出的网络方法阐明了大气路径，并能够客观评估全球变化下的淡水脆弱性和水资源短缺风险。所展示的流域相互依存关系强调了全球水治理以确保淡水供应的必要性。
