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<br />-8- <br /> <br />PROCESS RESPONSE <br />ELEMENTS ELEMENTS <br />I INDEPENDENT ^ <br /> SEMI-INDEPENDENT \ DEPENDENT <br /> I CLIMATE 1_ DRAINAGE BASIN FLOW PARAMETERS <br /> MORPHOMETRY - distribution <br /> t 1 of extremes <br /> . I <br /> I j . <br /> I <br /> I I <br /> I I <br /> BEDROCK I I <br /> I <br /> GEOLOGY * I I <br /> I I <br /> I USE I I <br /> AREAL LAND CHANNEL AND <br /> FLOODPLAIN <br />- SURFICIAL t t_______ MORPHOLOGY <br /> MATERIALS <br /> T <br /> <br />FIGURE 1. Process-response model of the research project. <br /> <br />surficial geology as well as on changes in climate, morphometry and land <br /> <br />use. These parameters exercise controls on channel and floodplain mor- <br /> <br />phology, which in turn influence land use, morphometry and flow para- <br /> <br />meters through feedback linkages shown as dashed arrows. Although this <br /> <br />model does not contain all possible relationships, it has identified the <br /> <br />most important variables and serves to define the system which will be <br /> <br />quantitatively modelled. <br /> <br />It is reasonable to assume that increased urban land use within a <br /> <br />basin will influence the frequency and magnitude of flood events in a <br /> <br />variable manner. The exact response should depend on the combined and <br /> <br />interacting effects of geology, topography and drainage network configu- <br /> <br />, <br /> <br />ration. It is also likely that climatic fluctuations would influence <br />