Monthly Water Balance Modeling by Linking Hydro-Climatologic and Tank Groundwater Balance Model

Sustainable management of water resources in various basins depends on accurate estimation of water balance. Reviewing literature of water balance models reveals that most published works are focused on hydro-climatologic water balance models, which consider aquifers like tanks with one or two soil layers. These models use empirical equations to calculate the effects of groundwater on hydro-climatological water balance. In this study, we have tried to advance previous studies by linking previously developed hydro-climatological and groundwater balance models. In the developed model in this study, the aquifers were modeled more accurately by using the tank-model approach. Optimizaing the parameters of the joint water balance model is an important step for achieving proper water balance model performance. In order to assess the performance of the recommended model, hydro-climatological and groundwater water balance in Neyshabur and Rokh plains were modeled in a nine-year period. The results proved that the proposed approach can be used for modeling water balance of other basins in the country. Although it was suggested that it can be better to use distributed modeling which allows considering interactions between surface water and groundwater resources.