长江科学院院报2016，Vol.33Issue(9)：1-4,22,5.DOI:10.11988/ckyyb.20160366
一种基于实际水深的通航保证率计算方法--以钱塘江河口七堡段为例
A Calculation Method for Cumulative Frequency Below Low Tidal Level of Navigation Based on Real Water Depth:Taking Qibao Section of Qiantang Estuary as Example
王卫标 1曾剑 2谢东风2
作者信息
- 1. 浙江省水利发展规划研究中心，杭州 310012
- 2. 浙江省水利河口研究院，杭州 310020
- 折叠
摘要
Abstract
The cumulative frequency of low tidal level of navigation is an important index for navigation channel de-sign,improvement and benefit evaluation.Normally,the cumulative frequency could be calculated by the number of days that the water level is higher than the designed lowest navigable water level.In the Qiantang river estuary of Zhejiang Province,the bed erosion and deposition is drastic,and the low tidal level is closely related to the bed el-evation changes.Hence the aforementioned method could not count definitely the cumulative frequency in Qiantang estuary.In this study,the historical bathymetries since 1980 were used to analyze the bed evolution patterns in the annual years at Qibao section in Qiantang estuary,and the relationships between the variations of low tidal level and the bed erosion/deposition were discussed.On this basis,a new method based on the actual water depth under dai-ly low tidal level was proposed for the calculation of cumulative frequency.According to the hydrological character-istics of Qiantang estuary,three typical hydrological years representing high flow year,normal flow year and low flow year were chosen to analyze the cumulative frequency of water depth for navigation in Qibao section.The re-sults show that in the three years,the cumulative frequencies at Qibao section could reach 100%,100% and 87%,respectively,which agrees with the reality.This method could be also applicable to other tidal estuaries where changes of bed elevation and low tidal level are remarkable.关键词
钱塘江/实际水深/通航保证率/河床冲淤/低潮位Key words
Qiantang estuary/cumulative frequency of low tidal level/bed erosion and deposition/low tidal level分类
建筑与水利引用本文复制引用
王卫标,曾剑,谢东风..一种基于实际水深的通航保证率计算方法--以钱塘江河口七堡段为例[J].长江科学院院报,2016,33(9):1-4,22,5.
