Somorowska Urszula
University of Warsaw, Faculty of Geography and Regional Studies, Department of Hydrology, Poland.
MethodsX. 2019 Mar 28;6:672-681. doi: 10.1016/j.mex.2019.03.021. eCollection 2019.
The streamflow elasticity concept based on the Budyko framework is widely used in hydrological impact assessment studies. However, in landscapes transformed by human activities, identification of climate contributions to runoff change is difficult due to changing surface properties of river basins. Here, a method is proposed to quantify the effects of changing vegetation cover and included them in the calculus. The simplified scheme to incorporate improved evapotranspiration estimates into the streamflow elasticity framework is introduced and named as "SSII-Evap" method. SSII-Evap allows for calculating runoff changes induced by climate taking into account: 1) changes in two climatic variables (precipitation and potential evapotranspiration) and 2) changes in land surface conditions responsible for varying actual evapotranspiration. The six-step procedure provides a focused guide for enhancing the original method. •The SSII-Evap method introduces a bias correction to the original bivariate framework of streamflow elasticity to climate change.•In contrast to the original method, SSII-Evap accounts for the influence of vegetation changes on actual evapotranspiration that is estimated from satellite-derived data.•The elaborated customization is helpful for discriminating between climatic and human induced changes in mean annual runoff and is applicable to heavily modified river basins.
基于布迪科框架的径流弹性概念在水文影响评估研究中被广泛应用。然而，在人类活动改造的景观中，由于流域地表性质的变化，很难确定气候对径流变化的贡献。在此，提出一种方法来量化植被覆盖变化的影响，并将其纳入计算。引入了一种将改进的蒸散估算纳入径流弹性框架的简化方案，并将其命名为“SSII - Evap”方法。SSII - Evap能够在考虑以下因素的情况下计算由气候引起的径流变化：1）两个气候变量（降水和潜在蒸散）的变化；2）导致实际蒸散变化的地表条件变化。这个六步骤程序为改进原始方法提供了有针对性的指导。•SSII - Evap方法对径流弹性针对气候变化的原始双变量框架引入了偏差校正。•与原始方法不同，SSII - Evap考虑了植被变化对根据卫星数据估算的实际蒸散的影响。•详细的定制有助于区分年均径流中气候和人类引起的变化，并且适用于受到严重改造的流域。
