Gully density estimates for dSedNet model input for the Western Port catchment, Victoria, Australia

Spatial input data to parameterise the gully erosion module of the dSedNet model to simulate sediment generation and transport in the Western Port catchment for a 2018-19 study commissioned by Melbourne Water.\nLineage: The 2003 gully map data were reprojected and spatially corrected. 'Active' gullies were determined through visual interpretation of aerial imagery from ESRI Base Layers (approx. 2013-2018) according to where the gully had sharply incised banks and/or presence of bare ground at base or edges. Some gullies were deleted where land use had changed and the gully was no longer visible, e.g. urban development, agriculture. New gullies were mapped where identified from recent aerial imagery. The workflow was executed within the ArcGIS (version 10.2) environment.本数据集为参数化dSedNet模型沟壑侵蚀模块的空间输入数据，用于模拟西港流域的泥沙产生与输移过程，相关研究由墨尔本水务局委托开展，执行时段为2018至2019年。 数据溯源：2003年沟壑地图数据经重投影与空间校正处理。通过目视解译ESRI基础图层（约2013-2018年）的航空影像，依据沟壑是否具有深切岸坡和/或沟底、沟缘存在裸露地表的特征，判定"活跃沟壑"。针对土地利用发生变更且沟壑已不可见的区域（如城市开发、农业耕作区域），删除原有沟壑；结合最新航空影像识别出的新增沟壑，则进行数字化成图。本数据处理工作流在ArcGIS（版本10.2）环境中完成。