The cost of ending groundwater overdraft on the North China Plain

Claus Davidsen, Suxia Liu, Xingguo Mo, Dan Rosbjerg, Peter Bauer-Gottwein

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Abstract

Overexploitation of groundwater reserves is a major environmental problem around the world. In many river basins, groundwater and surface water are used conjunctively and joint optimization strategies are required. A hydroeconomic modeling approach is used to find cost-optimal sustainable surface water and groundwater allocation strategies for a river basin, given an arbitrary initial groundwater level in the aquifer. A simplified management problem with conjunctive use of scarce surface water and groundwater under inflow and recharge uncertainty is presented. Because of head-dependent groundwater pumping costs the optimization problem is nonlinear and non-convex, and a genetic algorithm is used to solve the one-step-ahead subproblems with the objective of minimizing the sum of immediate and expected future costs. A real-world application in the water scarce Ziya River basin in northern China is used to demonstrate the model capabilities. Persistent overdraft from the groundwater aquifers on the North China Plain has caused declining groundwater levels. The model maps the marginal cost of water in different scenarios, and the minimum cost of ending groundwater overdraft in the basin is estimated to be CNY 5.58 billion yr-1. The study shows that it is cost-effective to slowly recover the groundwater aquifer to a level close to the surface, while gradually lowering the groundwater value to the equilibrium at CNY 2.15 m-3. The model can be used to guide decision-makers to economic efficient long-term sustainable management of groundwater and surface water resources.
Original languageEnglish
JournalHydrology and Earth System Sciences
Volume20
Issue number2
Pages (from-to)771-785
Number of pages15
ISSN1027-5606
DOIs
Publication statusPublished - 2016

Bibliographical note

© Author(s) 2016. This work is distributed under the Creative Commons Attribution 3.0 License.

Keywords

  • Earth and Planetary Sciences (miscellaneous)
  • Water Science and Technology
  • Aquifers
  • Cost effectiveness
  • Costs
  • Decision making
  • Genetic algorithms
  • Groundwater
  • Hydrogeology
  • Optimization
  • Recharging (underground waters)
  • Rivers
  • Surface water resources
  • Surface waters
  • Sustainable development
  • Water resources
  • Watersheds
  • Environmental problems
  • Groundwater aquifer
  • Groundwater overdraft
  • Groundwater reserves
  • Management problems
  • Optimization problems
  • Surface water and groundwaters
  • Sustainable management
  • Groundwater resources

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