刘家道口水文站多跨水文缆道技术探究

Technical Research on Multi-Span Hydrographic Cableway in Liujiadaokou Hydrologic Station

随着水文测验技术的不断发展和更新,新型的水文数据采集设备逐步武装到基层测站,提高了数据采集的时效性。水文缆道设计的合理与否,影响到新型流量测验设备的正常应用。刘家道口水文站属于大河重要控制站,缆道跨度810 m,已经超出了单跨缆道的适用范围。采用桥测法测流,水流受到桥墩的影响较大,流速仪不易稳定,测验精度较差,尤其在洪峰来临时测验相当困难,架设多跨缆道将会大大改善大跨度河流测流问题。结合水文缆道相关规范要求,总结以往多跨水文缆道技术经验与不足,设计并实施了刘家道口水文站多跨水文缆道项目。该缆道投入使用后,系统运行稳定,测洪能力满足防洪标准要求,提高了水文信息传输速度和测报精度。

With the development and updating of hydrometric technology, new hydrologic data collecting instruments are gradually equipped to the base hydrologic stations, which improve effectiveness for a given period of time to the data collection. The validity of hydrologic cableway design can affects the normal application of the new flow test equipments. Liujiadaokou hydrologic station is built according to an important control station for large rivers. The span of cable channel is 810 meters long, which has exceeded the applicable range of single-span cable channel. With the bridge-measurement method, the flow is greatly affected by the pier, the water velocity instrument is not easy to keep stable, and the measurement accuracy is poorer, especially in coming flood peaks. The erection of more span cableway will greatly improve the flow problem of the long-wide cable channel spanned river. Based on the relevant standard requests of hydrological cableway, we design and accomplish the multi-span hydrological cableway project of Liujiadaokou hydrologic station with the technical experience and overcome the previous multi-span hydrological cableway shortcomings. The cableway system has been put into operation and run stably. The flood hygrometry ability meets the requirements of flood control standard and improves the speed of hydrological data transmission and the measuring precision.