A new design of soil erosion and rainfall simulator is presented at 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 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 3D surface model. The results show that the mentioned methods give typical digital surface feature express especially of using 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 laser scanner that the cost of imaging equipment and software are used did not exceed 12% of TLS cost. Results of the statistical observations, a 3 order polynomial mathematical formula was generated through 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.

这项研究提出了一种新的土壤侵蚀和降雨模拟器设计，以试图推导描述土壤表面侵蚀现象的数学公式，以描述降雨模拟下沙质土壤的行为，监测土壤变形（例如沟渠和表面侵蚀小溪）。通过数字近距离摄影测量（DCRP）技术，包括使用智能手机摄像头和地面激光扫描仪（TLS）捕获数字图像，以将土壤表面数字化为智能点云数据，从而精确生成数字高程模型（DEM）达到0.10 mm 3D表面模型。结果表明，上述方法可以表达典型的数字表面特征，尤其是通过使用几何调整来控制数字表面的方向，尽管与激光扫描仪相比，数字成像特征检测技术的成本很小，但与使用成像设备和软件的成本不超过TLS成本的12％相比，它仍能获得准确的结果。统计观测的结果是，通过数字摄影测量法生成了一个三阶多项式数学公式，该公式将降雨模拟下的沙质土壤行为描述为侵蚀速率与不同坡度持续时间之间的关系。