Inspire harmonised – Borching

In the DOV database, any observation of soil layers is a drilling. For most drilling, a hole is made in the substrate with a drilling device to describe the various bases. A drilling gives you an image of the material in the subsoil with increasing depth. Depending on the purpose for which the drilling is placed, an appropriate drilling method will be used. Drilling is placed for exploratory soil testing, sampling of sediment and/or groundwater, determination of soil physical parameters, environmental testing, etc. Depending on depth, type of material, and drilling below the groundwater table may be selected from several systems for drilling manually or mechanically. The soil material released may be used to establish a profile of the substrate or to take soil samples from it to carry out further analyses. The aim is often to develop a sink to extract water (see also groundwater sampling network and groundwater permits). Drilling is sometimes carried out to determine a number of geotechnical characteristics or to carry out scientific research. Superficial observations of the substrate also call drilling. In particular around 1900, a number of geologists often described the superficial layers. The database therefore contains several drilling operations with a depth of 0 metres. These are mainly road cuttings or visible lithological characteristics along the surface. Where available, formal stratigraphy interpretations are also linked to the drilling.在DOV数据库（DOV Database）中，所有土层观测均以钻孔（drilling）形式记录。对于多数钻孔作业，需借助钻探设备在基底土层中开孔，以刻画各类土层基底特征。单次钻孔可呈现不同深度下的地下土层物质分布状况。根据钻孔布设的目标，会选用适配的钻探工艺。钻孔作业可应用于土壤勘探测试、沉积物及/或地下水采样、土壤物理参数测定、环境监测等诸多场景。依据钻探深度、物质类型以及地下水位以下的钻探需求，可从多种人工或机械钻探系统中选取合适方案。采集得到的土壤物质可用于构建基底土层剖面，或从中提取土壤样本以开展后续分析。其布设目的通常为建造抽水井以获取地下水（相关内容可参见地下水采样网络与地下水取水许可）。有时也会开展钻孔作业以测定多项岩土工程特性，或推进科学研究。对基底土层的浅层观测同样归类为钻孔作业。尤其在1900年前后，诸多地质学家常对浅层土层进行详细描述。因此该数据库收录了若干深度为0米的钻孔记录，此类记录大多取自路堑边坡或地表可见的岩性特征。若有可用资料，还会将正式的地层学解译结果关联至对应钻孔记录。