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Martin-Pierre Lavigne, Alain N. Rousseau, Richard Turcotte, Anne-Marie Laroche, Jean-Pierre Fortin, and Jean-Pierre Villeneuve

that there is a direct link between the proportion of the deforested area and the variation of annual runoff. Stednick ( Stednick, 1996 ) estimated that the hydrological regime of a watershed is affected only when 20% or more of the total area have been deforested. More specifically, Bosh and Hewlett ( Bosh and Hewlett, 1982 ) established that a modification of land use of softwood species on 10% of the total area could cause an increase of annual runoff of 40 mm, while this same modification could

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Gemma T. Narisma and Andrew J. Pitman

been used to study the effect of vegetation and LCC on weather and climate ( Copeland et al., 1996 ; Pielke et al., 1999 ; Eastman et al., 2001a ; Eastman et al., 2001b ; Strack et al., 2003 ). RAMS is coupled to GEMTM, a plant model that simulates the dynamic interaction between the biosphere and atmosphere ( Chen and Coughenor, 1994 ). This allows the vegetation to respond to changes in CO 2 concentration and climate. At each time step, GEMTM calculates stomatal conductance, separately for C

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Ademola K. Braimoh and Paul L. G. Vlek

water management in the Volta basin. LUCC information is crucial for the envisaged DSS for two reasons. First, land surface determines how much of the rainfall evaporates and how much becomes available as groundwater. Second, land cover determines the energy exchange between land and atmosphere and therefore local weather patterns. The current research provides land-use data for integration with other data for the envisaged DSS. 3. Methods 3.1. Data sources Landsat Thematic Mapper (TM) data acquired

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