Value and modelling of conjunctive use of surface and ground waters in basin management

摘要

In planning exercises, the interaction between stream and aquifer must be properly described and incorporated in the day-to-day management of the resource within a complex system of economic interests, laws and administrative rules. The manner in which the modelling system SAMSON (Stream-Aquifer Model for Management by Simulation and Optimization) was used to evaluate the worth of an augmentation plan in the State of Colorado, USA, is reviewed. The adequacy and benefits of the plan are presented. They demonstrate clearly the value of having modelled the system with a tool capable of representing it at a sufficient level of physical detail. Four original mathematical and computational features are discussed: (a) the use of a "scanning subgrid"; (b) "sequential re-initialization" through the concept of (c) the "Artificial Steady-State pumping pattern"; and (d) reach transmissivity.