How runoff begins (and ends): Characterizing hydrologic response at the catchment scale

摘要: [1] Improved understanding of the complex dynamics associated with spatially and temporally variable runoff response is needed to better understand hydrology component interdisciplinary problems. The objective this study was quantitatively characterize environmental controls on generation for range different streamflow-generation mechanisms illustrated in classic Dunne diagram. comprehensive physics-based model coupled surface-subsurface flow, InHM, employed a heuristic mode. InHM has been previously successfully simulate observed hydrologic at four diverse, well-characterized catchments, which provides foundation study. C3 CB catchments are located within steep, forested terrain; TW R5 gently sloping rangeland. boundary-value problems these provide corner-stones alternative simulation scenarios designed address question how begins (and ends). Simulated rainfall-runoff events used systematically explore impact soil-hydraulic properties rainfall characteristics. This approach facilitates quantitative analysis both integrated distributed responses high-spatial temporal resolution over wide conditions represented by catchments. results from 140 unique illustrate intensity/depth, subsurface permeability contrasts, characteristic curve shapes, topography important hydrologic-response dynamics. processes ends) shown, large part, be defined relative rates rainfall, infiltration, lateral flow convergence, storage variably saturated soil layers.