A new modeling approach for simulating microtopography-dominated, discontinuous overland flow on infiltrating surfaces

摘要: Abstract Realistic modeling of discontinuous overland flow on irregular topographic surfaces has been proven to be a challenge. This study is aimed develop new framework simulate the puddle-to-puddle (P2P) dynamics for infiltrating with various microtopographic characteristics. In P2P model, puddles were integrated in well-delineated, cascaded drainage system facilitate explicit simulation their dynamic behaviors and interactions. Overland infiltration respectively simulated by using diffusion wave model modified Green–Ampt DEM-derived network that consisted series puddle-based units (PBUs). The was tested data from laboratory experiments microtopography, soil, rainfall conditions. results indicated hierarchical relationships properties significantly affected connectivity, filling–spilling dynamics, associated threshold flow. Surface microtopography characteristics also exhibited strong influences spatio-temporal distributions rates, runoff fluxes, unsaturated tests demonstrated its applicability simulating microtopography-dominated surfaces.