摘要
为了提高径流总量计算精度，用积分公式法计算径流总量。将水文过程线按10min间隔分段，在流量计算过程中，根据水位在各个时段和时间的线性函数关系，把流量系数～水位的函数关系转变成流量系数一时间的函数关系，从而对流量系数进行各时间段的定积分，同时用传统的瞬时流量系数法计算各个时段的径流量，并汇总各个径流事件的日、月和年径流量。结果表明：按照2000年5个观测点的资料，以积分公式法计算的各个观测点年径流量比瞬时流量系数法计算的结果精度提高8．7％～17．1％。
In hydrological experiments, the flux （ m3 ） of various types of weir was well studied while the study on the accuracy of the calculation of the amount of water discharge was neglected. A new integral equation method was developed and applied to improve the accuracy of the calculation of the amount of water discharge. The water level hydrograph of each rainfall-runoff event was divided into periods at ten minute intervals. In each period, a water level- time linear function was established. Then, the water level-flux relationship was transferred into a function between flux and time in each period for integration. Thus a new integral equation method was developed to calculate the amount of water discharge in sub-catchments and catchments. At the same time, the instant flux coefficient method was applied to calculate not only water discharge in each period of ten minute interval, but also day, monthly and annual water discharge. The result showed that the new integral equation method can improve the accuracy of annual water discharge by 8.7% --17.1% at five monitoring sites using the field observation data in the year of 2000. The integral equation method improved the area-flux method with a mathematical integral equation. Compared with the instant flux coefficient method, the new method improve accuracy greatly and was suitable for the calculation of the amount of water discharge at weirs on various conditions of water level variation.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第6期147-150,共4页
Journal of Nanjing Forestry University：Natural Sciences Edition
基金
国家“十一五”科技支撑项目(2006BAD03A16)
国家自然科学基金资助项目(30872072)
关键词
积分公式法
径流量
瞬时流量系数法
Integral equation method
Water discharge
Instant flux coefficient method
