Estimation of the Interaction Between Groundwater and Surface Water Based on Flow Routing Using an Improved Nonlinear Muskingum-Cunge Method

The interaction between groundwater (GW) and surface water (SW) not only sustains runoff in dry seasons but also plays an important role river floods. Lateral inflow is the recharge of to during a flood; this part GW-SW exchange. Hydrological engineers proposed idea modelling flood routing using Muskingum-Cunge method, which exchange fully considered. This study proposes improved nonlinear model that considers lateral inflow; new method denoted as NMCL1 NMCL2 can simulate calculate In addition, both linear inflows (with channel inflows) are discussed, stable occur due considered for first time. A sensitivity analysis shows different parameters have effects on simulation results. Three cases documented literature selected compare four classical two updated methods. Two floods River Wye verify accuracy calibrated model. results compared with temperature inversion measured from Zhongtian River, China, indicate feasibility reliability method. comparison that, several cases, capable obtaining optimal inherits ability Maskingum-Cunge routing. Moreover, it quantify exchange, estimations owed nonlinearity sign flexibility calculated process.