SEHR-ECHO v1.0: a Spatially Explicit Hydrologic Response model for ecohydrologic applications

摘要

This paper presents the Spatially Explicit Hydrologic Response (SEHR) modeldeveloped at the Laboratory of Ecohydrology of the Ecole PolytechniqueFédérale de Lausanne for the simulation of hydrological processes atthe catchment scale. The key concept of the model is the formulation of watertransport by geomorphologic travel time distributions through gravity-driventransitions among geomorphic states: the mobilization of water (and possiblydissolved solutes) is simulated at the subcatchment scale and the resultingresponses are convolved with the travel paths distribution within the rivernetwork to obtain the hydrologic response at the catchment outlet. The modelthus breaks down the complexity of the hydrologic response into an explicitgeomorphological combination of dominant spatial patterns of precipitationinput and of hydrologic process controls. Nonstationarity and nonlinearityeffects are tackled through soil moisture dynamics in the active soil layer.We present here the basic model set-up for precipitation–runoff simulationand a detailed discussion of its parameter estimation and of its performancefor the Dischma River (Switzerland), a snow-dominated catchment with a smallglacier cover.