Coupled modeling of hydrologic and hydrodynamic processes including overland and channel flow

摘要: Abstract A coupling framework between a hydrologic model and hydrodynamic has been developed. The resultant coupled model, tRIBS-OFM, considers spatially-distributed, physically-based processes over the land-surface subsurface by using TIN (Triangulated Irregular Network)–Based Real Time Integrated Basin Simulator (tRIBS); component is overland flow (OFM), which solves two-dimensional Saint–Venant (shallow-water) equations Roe’s approximate Riemann solver on an unstructured grid. original OFM formulation targeted hydraulic applications did not provide accurate solution for partially-submerged mesh cells. Modifications of are presented here that affect calculation flux, bottom slope, friction slope terms applying new method reconstruction variables. proposed significantly enhances accuracy resolving typical numerical artifacts associated with low precipitation runoff production rates. Several comparisons analytical solutions, observed data, other models have carried out different domain geometries various conditions. Two to synthetic real-world basin, Peacheater Creek watershed (64 km 2 ) located near Christie, OK, USA, also demonstrate scalability model’s application its robust performance. Various metrics simulation illustrated, such as occurrences rates, streamflow, depth, velocity, etc. makes feasible range problems based kinematic or inertia-free approximations cannot simulate accurately. These include microtopographic disturbances due vegetation obstacles, backwater effects, converging–diverging characteristics. thus provides more comprehensive capabilities affected assumptions regarding reproduced regime.