الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
A new design of soil erosion and rainfall simulator is presented in this study as an attempt to deduce a mathematical formula of soil surface erosion phenomenon to describe the behavior of the sandy soil under the rainfall simulation, soil deformation such as gullies and surface eroding rills are monitored by the Digital Close Range Photogrammetry (DCRP) technique that includes capturing digital images with a smart cellphone camera, and a Terrestrial Laser Scanner (TLS) to digitalize the soil surface as a smart point cloud data to produce Digital Elevation Models (DEM) with accuracy reaches 0.10 mm surface modeling. The results show that the mentioned methods give typical digital surface feature express especially of using the geometrical adjustment that controls the orientation of the digital surface, the digital imaging feature detection technology achieves accurate results despite its small cost compared to the TLS that the cost of imaging equipment and software are used did not exceed about 12% of TLS cost. According to the statistical observations, a third-order polynomial mathematical formula was generated using the digital photogrammetry method that describes the sandy soil behavior under the rainfall simulation as a relation between the eroding rate and the duration through the different slopes.
This study aims to investigate the accuracy of DCRP as a digital technique that uses a computer photogrammetric software which is PhotoModeler, this one based mainly on two mathematical models to determine some measurement quantifications, DLT and SIFT will be discussed as an explanation of the software technology that achieved an accuracy of 0.02 mm models adjustment.
Keywords: Rainfall simulation, Soil erosion, Digital Close Range Photogrammetry, Mathematical formula, Calibration.