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为提高给水管网水力模型的精确性和可信度,减少管网建模初期基础资料收集的工作量,在给水管网建模过程中引入GPS实测。以东北某特大城市为例,通过全站仪结合GPS的方法,采用GPS-RTK模式,对水源节点及压力监测点进行高精度的三维测量,并且获取管道阻力和阀门阻力实测中压力表和阀门的标高,其精度远高于传统估算方法的。GPS可做到区域内多点同时同步测量,简化了大范围内管线测量的诸多工作程序,极大地提高了工作效率;同时还提高了数字化管网图形精度,在全微机操作条件下避免了人为误差,确保了模型精度,是管网数字化的一种全新作业方式。
In order to improve the accuracy and reliability of the hydraulic model of the water supply network and reduce the workload of basic data collection in the early stage of the network modeling, GPS measurement was introduced in the process of modeling the water supply network. Taking a megacity in northeastern China as an example, GPS-RTK mode is adopted by total station and GPS, and three-dimensional measurement of water source node and pressure monitoring point is carried out with high accuracy. Pipe pressure resistance and valve resistance are measured. Of the elevation, the accuracy is much higher than the traditional estimation methods. GPS can be done within the region at the same time more simultaneous measurements, simplifying a wide range of pipeline measurement procedures, greatly improving the work efficiency; also improve the digital network graphics accuracy, the entire computer operating conditions to avoid the artificial Error, to ensure the accuracy of the model is a new way of pipe network digital operation.