Automatic System Of Hydrologic Data Collection And Transmission On The Right Main Tributaries Of Nen River

The current technology development status of hydrological data automatic collection and transmission in China and other countries was summarized in this paper. On a basis of this, the natural geographic features, rainstorm and flood characteristic and water projects operation status were investigated and analyzed in details. Station network arrangement, flood forecasting and communications group network schemes of this system were determined in combination with river basin features and practical flood control requirements. The construction and management system, and operation and maintenance tasks were identified.The floods of the main stream of Nen River generate mainly from its right tributaries. The amount of rainstorm and runoff are quite large. The speed of conflux is high. However the changes of rainstorm and flood conditions are difficult to be predominated because the density of hydrological observation station network is much lower than the national standard and average level of the basin. So it cannot meet the requirements of flood control. The system covers the area from Ni'erji to Sanchahe of the main stream of Nen River, and its right main tributaries basins, including Nuomin River, Huanghao River, Alun River, Yin River, Yalu River, Chao'er River, Tao'er River, Huolin River. The 9 flood forecasting sections on the mainstream and main tributaries of Nen River were selected according to the importance of flood control objects and condition of hydrological observation stations. The flood forecasting schemes were carried out. The scale of this system was determined after the hydrological observation station network was reasoned. The system includes one system center, 3 provincial centers, 8 system sub- centers, 284 remote sensing stations, which consists of 198 newly constructed and 86 updated remote sensing stations. The system communications group network scheme andoperating system were basically determined. The system administration mode was put forward. The system operating and maintenance cost was put into effect. The circuits of remote sensing station network in the project proposal were tested and reasoned. It was found out that the station network in the planned phase of the proposal was unreasonable in some way. Therefore the author of this paper adjusted and optimized some observation stations, which are located in remote area where traffic are inconvenient and equipment are difficult to install and maintain. The stations, in which circuits are obstructed and communications are difficult to get through, are reduced properly. The adjusted remote sensing station network is reasonable and can meet the requirement of optimization. The most stations in the automatic system of hydrological data collection and transmission on the right main tributaries of Nen River are located in the mountainous area of Daxing'anling and primordial forest. Therefore the construction and operation environment is very atrocious. The investment will be higher than in other regions. The construction and equipment purchase cost was reduced after the station network adjustment. It was suggested that the total static investment of the automatic system of hydrological adapt collection and transmission on the right main tributaries of Nen River was adjusted from 60.95 million into 56.4 million Yuan RMB.The different features of 3 existed systems and 4 systems under construction were taken into account in this paper. These systems were included into the entire network as a sub-system. Therefore, it requests that the systems with different transmission systems, different type equipment, and different database structures must be compatible and be integrated into one entire system.