LANDSCAPE ECOLOGY SREM 3011 LECTURE 13 Dr Brendan Mackey Department of Geography The Australian National University
LANDSCAPE ECOLOGY SREM 3011 LECTURE 13 Dr Brendan Mackey Department of Geography The Australian National University
Main limitation of ' bucket MI method is that it does not factor in catchment hydrological processes: PRECIPITATION EVAPORATION overland flow: infiltration throughflow processes are topographIc Surface own ally driven glacier- INFILTRATION spatial modelling of these processes requires a suit- ably scaled digital elevation model (DEM) GROUNDWATER BASEFLOW Water shed hydrology: the passage of precipitated water through vegetation cover, soil and rock to the stream. Precipitation falls over the whole watershed and is concentrated in stream channels NB Focus here on humid, erosional landscapes, not dry depositional landscapes
Water shed hydrology: the passage of precipitated water through vegetation cover, soil and rock to the stream. Precipitation falls over the whole watershed and is concentrated in stream channels. • Main limitation of ‘bucket’ MI method is that it does not factor in catchment hydrological processes: overland flow; infiltration; throughflow processes are topographically driven spatial modelling of these processes requires a suitably scaled digital elevation model (DEM) NB Focus here on humid, erosional landscapes, not dry depositional landscapes
Simulation models of catchment hydrology: many deterministic and empirical models all model water flow in the catchment as a function of: 1. Topographic characteristics and 2 Soil characteristics Highly parametrised models(eg. CSIRO 'Topog difficult to 'runor implement across landscapes due to lack of required spatial data Therefore' simple'models are“ popular
• Simulation models of catchment hydrology: - many deterministic and empirical models - all model water flow in the catchment as a function of: 1. Topographic characteristics and 2. Soil characteristics - Highly parametrised models (eg. CSIRO ‘Topog’) difficult to ‘run’ or implement across landscapes due to lack of required spatial data - Therefore ‘simple’ models are “popular
Exam ples of profiles across terrain divided into morphological types of landform element C F UX R C UA M LN Position in topo-sequence"as an index of run-on/run-off
“Position in topo-sequence” as an index of run-on/run-off Examples of profiles across terrain divided into morphological types of landform element
Slope lines overlaid on a contour map show ridge lines and course lines SUMMIT N氏S PASS
Slope lines overlaid on a contour map show ridge lines and course lines