SIMULATION THE IMPACT OF LAND-USE CHANGES ON RUNOFF HYDROGRAPHS THROUGH REMOTE SENSING

LGCH Guelma, Université de Guelma, Algeria

**TU-Berlin, Faculty of Civil Engineering and Geosciences, Department of Hydrogeology Germany,

The increase in population density and building density exert the most obvious influence on

hydrological processes in an urban area. Modification of the land surface during urbanisation

alters the stormwater runoff characteristics. The major modification which alters the runoff

process is the impervious surfaces of the catchment such as roofs, side walks, roadways and

parking lots, which were previously pervious. Within the framework, a physically based

hydrological model coupled with the SCS curve number method is presented to assess the

runoff changes due to land-use changes. In order to approach a reasonable result in hydrologic

modelling satellite based remote technologies are used to extract land surface parameters.

Future changes in land use can also be incorporated in the model once digital database is

available and the change in runoff production can be found out. Thus land-use planning and

management can be done efficiently. The relationships developed between changes in runoff

with respect to a change in CN are very useful to quantify the effect of land-use change. The

change in peak runoff values can be estimated for a basin having known changes in land-use

for known rainfall. The study clearly demonstrated that the integration of spatial data and the

application of a physically based model in a remote sensing environment provide a powerful

tool for the assessment of an effect due to land-use change.