Feedback of land subsidence on the movement and conjunctive use of water resources

Environmental Modelling and Software
By: , and 

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Abstract

The dependency of surface- or groundwater flows and aquifer hydraulic properties on dewatering-induced layer deformation is not available in the USGS's groundwater model MODFLOW. A new integrated hydrologic model, MODFLOW-OWHM, formulates this dependency by coupling mesh deformation with aquifer transmissivity and storage and by linking land subsidence/uplift with deformation-dependent flows that also depend on aquifer head and other flow terms. In a test example, flows most affected were stream seepage and evapotranspiration from groundwater (ETgw). Deformation feedback also had an indirect effect on conjunctive surface- and groundwater use components: Changed stream seepage and streamflows influenced surface-water deliveries and returnflows. Changed ETgw affected irrigation demand, which jointly with altered surface-water supplies resulted in changed supplemental groundwater requirements and pumping and changed return runoff. This modeling feature will improve the impact assessment of dewatering-induced land subsidence/uplift (following irrigation pumping or coal-seam gas extraction) on surface receptors, inter-basin transfers, and surface-infrastructure integrity.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Feedback of land subsidence on the movement and conjunctive use of water resources
Series title Environmental Modelling and Software
DOI 10.1016/j.envsoft.2014.08.006
Volume 62
Year Published 2014
Publisher Elsevier
Contributing office(s) California Water Science Center
Description 18 p.
First page 253
Last page 270
Online Only (Y/N) N
Additional Online Files (Y/N) N