摘要
连云港港深水航道是开敞海域淤泥质浅滩深水航道的典型。航道回淤规律和实践表明,连云港淤泥质浅滩深水航道中风天回淤量为航道回淤的主体,占年回淤总量的60%左右。由于中风天频率年际变化较大,导致航道年际回淤水平变幅较大。现有设计回淤量计算模式均未考虑风天分级。提出了"按小、中、大3个概化波浪动力计算回淤强度、再组合各自波浪频率得到设计回淤量"的开敞海域淤泥质浅滩深水航道设计年回淤量计算方法。该方法能够较为合理地体现全年波浪水平和波浪频率年际间差异对年回淤量的影响程度,显著提高了设计年回淤量预报精度,为合理确定开敞海域淤泥质浅滩深水航道的设计年回淤量水平和变化范围、正确评价航道的稳定性和技术可行性提供科学依据。经连云港区25万吨级航道和徐圩港区10万吨级航道工程实践检验,预报回淤量与实际回淤量偏差不超过25%。
Lianyungang port deepwater channel is the typical case of the deepwater channel of muddy shoalin open waters. Siltation law and practice show： The siltation intensity which accounts for about 60% of total annualsiltation amount of middle wave day is the main part of the channel siltation.Due to obvious interannual variability ofmiddle wave frequency, the range of siltation amount is large. Wave classification has not been considered by allexisting siltation calculation mode.It is proposed innovatively that deepwater channel siltation prediction method formuddy shoal in open waters, which is＂based on the siltation intensity of three generalized wave levels, gets thedesign siltation amount according to each wave level frequency.＂The method can reasonably reflect the effect tosiltation of year-round wave intensity and wave level frequency range in different years.And it significantly improvesthe forecast accuracy of design siltation amount. It provides a scientific basis for ensuring the deepwater channelsiltation amount and range prediction, the channel stability and technical feasibility research.It had been verified by250 000 DWT of Lianyun port waterway and 100 000 DWT of Xuwei port waterway engineering practice. Thedeviation between prediction and actual amount is less than 25%.
出处
《水运工程》
北大核心
2016年第11期114-120,共7页
Port & Waterway Engineering
基金
国家高技术研究发展计划课题(2012AA112509)
