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Efficient numerical incorporation of water management operations in integrated hydrosystem models: Application to tile drainage and reservoir operating systems

Hwang, Hyoun-Tae, Park, Young-Jin, Frey, Steven K., Callaghan, Michael V., Berg, Steven J., Lapen, David R., Sudicky, Edward A.
Journal of hydrology 2019 v.575 pp. 1253-1266
farms, groundwater, groundwater extraction, hydrologic models, streams, surface water, tile drainage, water allocation, water flow, water rights, water supply, wells
Hydrologic control structures are designed to connect or disconnect water movement in natural surface water-groundwater systems, and it is important to represent these features effectively within a finite difference/element model without over-discretization. This study presents efficient numerical schemes for operating water allocation and water rights systems in integrated hydrosystem models. We developed a numerical scheme for representing these structures directly within integrated surface/subsurface hydrologic models by creating boundary condition links to route water through control structures or by breaking nodal connections to prevent water flow. The boundary condition linking and mesh cutoff schemes minimize the need for mesh regeneration and modification. Through illustrative examples involving agricultural tile drainage and dam-reservoir operation systems, the numerical connection (boundary condition linking) and disconnection (mesh cutoff) techniques are demonstrated to be effective and efficient at simulating the hydrological processes affected by anthropogenic water resources controls. A proof-of-concept demonstration consisting of complex water supply (dam and groundwater pumping wells) and demand (farms, municipality, and stream) highlights how the numerical schemes for water management operations can be used to optimize surface water and groundwater extraction and distribution using a fully-integrated model.