Hydrological processes of a rainforest headwater swamp from natural chemical tracing in Nsimi watershed, Cameroon

摘要: The hydrological role of a headwater swamp in tropical rainforest is studied using chloride mass balance (CMB) and end-member mixing analysis. There are three main contributions to streamflow: (1) the hillside bedrock aquifer, (2) overland flow from during storm events (3) groundwater aquifer. Before rainfall wet season, pre-event water comprises mix 80% aquifer 20% During storms, relative contribution increases according intensity initial saturation rate reservoirs. yearly stream about 31%. relationship between fluctuates with space time. Generally, drained by stream; however, at end long dry seasons, after first rains, indirect recharge occurs hydraulic gradient inversion net only 4%, which much lower than 65%. Recharge on being very low, these results suggest that, except for few storms Nsimi does not contribute flood attenuation. Evapotranspiration higher swamp. Nevertheless, depletion stored within dominated evaporation rather its streamflow. export solutes through below weir low (< 7%). most active area weathering watershed.