Xu Shiguo, Li Wenyi
School of Civil Engineering & Hydraulic Engineering, Dalian University of Technology,
Dalian 116023, China

Abstract: Flood water utilization is one of effectual measures to relieve the water shortage. This measure not only can lessen the flood disaster, but can increase the supply of the water resources. At the point of the river ecosystem balance, river water utilization and flood protection, the theory of the River Water Structure (RWS) can be introduced. According to this theory the river water can be divided into four parts, namely environment water portion (EWP), safety water portion (SWP), risk water portion (RWP) and disaster water portion (DWP). The limit boundaries between the different water portions are the vital factors in the RWS, which can be determined by different methods.

Based on the hydrologic data from 1953 to 2002, the RWS of the Jiangqiao and Dalai hydrologic station can be researched. According to the calculation results, the annual four water portions variation tendency, the four water portions proportion of the long-time average annual value and the characteristic years as well as the appearing frequency of the RWP and the DWP can be analyzed. The results indicate that the theory of the RWS can provide better thinking for the flood prevention as well as utilization of river water more effective.

Key words: Nenjiang River; flood water utilization; river water resources; structural analysis