Representing Human Water Management in a Land Surface Model Using a Supply/Demand Approach

The impact of human water management on river discharge is increasingly viewed as a missing process in Earth system modeling. Models which have attempted to include it are generally at coarse resolution and uncoupled the atmosphere. We propose describe high spatial using ORganizing Carbon Hydrology In Dynamic EcosystEms concept hydrological-transfer-units routing parametrization. Irrigated areas linked abstraction points minimization process. directed graphs flows adduction network for irrigation transposed propagate demands upstream. Reservoirs dams placed along graph balance supply four chosen value classes. Dam regulation assumed maximize demand satisfaction dampen floods while respecting properties infrastructure. developed module applied Yellow River where dam known strong impact. Results show that strongly heterogeneous over space. It propagates channels can be mitigated by confluence tributaries. Moreover, has seasonality due time varying response regulation. A number uncertainties still remain affect simulated discharge. Nevertheless, representation improves model's behavior terms magnitude intra-annual variations discharge, offers opportunity implement anthropogenic processes cycle System Models.