Urbanization processes have caused changes in the runoff behavior, especially by impervious surfaces produced by paving and buildings. Impermeable surfaces prevent the infiltration of rainwater, increasing the volume and speed of runoff. Besides, inadequate urban planning coupled with heavy rains promotes the evolution of erosion processes, especially in peri-urban areas. This research aims to identify spatial patterns of geomorphic change in the gully areas due to urbanization in the city of Jacareí (SP). The methodology has the following steps: (1) elaboration of the Digital Elevation Model (DEM) from stereophotogrammetric techniques; (2) elaboration of the pre- and post-urbanization DEM; (3) extraction of contributing area using the D-Infinity method and of the topographic indices (topographic wetness, stream power, and compound topographic); and (4) calculate the difference between the pre- and post-urbanization topographic attributes. The preparation of the pre- and post-urbanization DEM used the MATCH-T DSM and DTMaster modules, both belonging to the INPHO system. Photogrammetric techniques allow the generation of digital models suitable for hydrological studies. The urbanization exposed an evident influence on the triggering of erosion, evidencing an increase of all topographic indices in areas that develop gullies.

中文翻译：

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在城市化之前和之后的场景之间使用地貌变化检测评估沟壑发展

城市化进程引起了径流行为的变化，特别是由于铺路和建筑物产生的不透水表面。不可渗透的表面可防止雨水渗入，增加径流量和速度。此外，不充分的城市规划加上大雨会促进侵蚀过程的发展，特别是在郊区。这项研究旨在确定由于Jacareí（SP）市的城市化而导致的沟壑区地貌变化的空间格局。该方法包括以下步骤：（1）通过立体摄影测量技术阐述数字高程模型（DEM）；（2）详细说明城市化前后的DEM；（3）使用D-Infinity方法提取贡献面积和地形指数（地形湿度，流功率和复合地形）；（4）计算城市化前后地形属性之间的差异。城市化之前和之后的DEM的准备工作都使用了MATCH-T DSM和DTMaster模块，它们都属于INPHO系统。摄影测量技术允许生成适用于水文学研究的数字模型。城市化暴露了对侵蚀触发的明显影响，表明在发生沟壑的地区所有地形指数都在增加。