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Land use as a mitigation strategy for the water-quality impacts of global warming: a scenario analysis on two watersheds in the Ohio River Basin

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Environmental Engineering and Policy

Abstract

This study uses an integrative approach to study the water-quality impacts of future global climate and land-use changes. In this study, changing land-use types was used as a mitigation strategy to reduce the adverse impacts of global climate change on water resources. The climate scenarios were based on projections made by the Intergovernmental Panel on Climate Change (IPCC) and the United Kingdom Hadley Centre’s climate model (HadCM2). The Thornthwaite waterbalance model was coupled with a land-use model (LTHIA) to investigate the hydrologic effects of future climate and land-use changes in the Ohio River Basin. The land-use model is based on the Soil Conservation Service’s curve-number method. It uses the curve number, an index of land use and soil type, to calculate runoff volume and depth. The Arc View programming language, A venue, was used to integrate the two models into a geographic information system (GIS). An output of the water-balance model, daily precipitation values adjusted for potential evapotranspiration, served as one of the inputs into the land-use model. Two watersheds were used in the present study: one containing the city of Cincinnati on the main stem of the Ohio River, and one containing the city of Columbus on a tributary of the Ohio River. These cities represent two major metropolitan areas in the Ohio River Basin with different land uses experiencing different rates of population growth. The projected hypothetical land-use changes were based on linear extrapolations of current population data. Results of the analyses indicate that conversion from agricultural land use to low-density residential land use may decrease the amount of surface runoff. The land-use practices which generate the least amo.unt of runoff are forest, low-density residential, and agriculture; whereas high-density residential and commercial land-use types produce the highest runoff. The hydrologic soil type present was also an important factor in determining the amount of runoff and non-point-source pollution. A runoff-depth matrix and total nitrogen matrix were created for Cincinnati and Columbus to describe possible land-use mitigation measures in response to global climate change. The differences in Cincinnati and Cohunbus were due to differences in geographic location, air temperature, and total runoff. The results of this study may be useful to planners and policy makers for defining the possible impacts of future global climate and land-use changes on water resources.

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Correspondence to Susanna T.Y. Tong.

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We would like to thank J. Harbor of Purdue University for the use of the L-THIA model and S. A. Thompson of Millersville University for the Thomthwaite water-balance model. We also thank R. Clark and B. Lykins of the National Risk Management Research Laboratory of the U.S. Enrironmental Protection Agency for their helpful assistance.

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Liu, A.J., Tong, S.T. & Goodrich, J.A. Land use as a mitigation strategy for the water-quality impacts of global warming: a scenario analysis on two watersheds in the Ohio River Basin. Environmental Engineering and Policy 2, 65–76 (1999). https://doi.org/10.1007/BF03500900

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