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为了准确地探测渠线位置和进行纵断面测量,在渠道选线的同时应布设一些高程控制点,用规定的水准测量方法精确测定其高程,这些点也称水准点(Bench Mark),简记为BM。一、高程控制点的布设用于渠道测量的高程控制点一般应沿渠线每隔1～3公里左右设一个,布置在渠线附近且不会因施工而遭到破坏的地方。这些点可组成以下形式: (一)附合水准路线。如图1(a)。当测区附近有两个已知高级水准点时,可从一已知点(BM_(Ⅲ-A))开始,依次测出渠道各控制点的高程,最后连测到另一已知点(BM_(Ⅲ-B))。
In order to accurately detect the location of the channel and to measure the vertical section, some elevation control points should be set up at the same time as the alignment of the channels, and the elevation must be accurately measured by the prescribed leveling method. These points are also called Bench Marks. For the BM. First, the deployment of elevation control points Elevation for the channel measurement control points should generally be located along the canal every 1 to 3 km, arranged near the canal line and will not be damaged due to construction. These points can be grouped into the following forms: (a) Attaching a standard course. As shown in Figure 1 (a). When there are two known advanced level points near the survey area, we can measure the elevation of each control point of the channel from one known point (BM_ (Ⅲ-A)) and finally measure another known point BM_ (III-B)).