海州湾水流紊动强度和含沙量对沉降速度的影响研究  

Study on the influence of turbulence intensity and sediment concentration on the settling velocity in Haizhou Bay

作　　者：朱文谨 王娜 董啸天 丛新 韩雪 潘锡山 ZHU Wenjin;WANG Na;DONG Xiaotian;CONG Xing;HAN Xue;PAN Xishan(School of Civil and Ocean Engincering,Jiangsu Ocean University,Lianyungang 222005,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Jiangsu Marine Environment Monitoring and Forecasting Center,Nanjng 210036,China)

机构地区：[1]江苏海洋大学土木与港海工程学院,江苏连云港222005 [2]同济大学土木工程学院,上海200092 [3]江苏省海涂研究中心,江苏南京210036

出　　处：《海洋通报》2020年第4期475-480,506,共7页Marine Science Bulletin

基　　金：港口航道泥沙工程交通行业重点实验室开放基金(Yn918003);海岸灾害及防护教育部重点实验室开放研究基金;国家重点研发计划(2017YFC1404203);江苏省自然科学基金青年基金(BK20180803,BK20170871);国家科技支撑计划(2013BAB04B03)

摘　　要：选取海州湾近岸潮流和含沙量实测资料,分析水体紊动强度与含沙量对近岸絮凝体沉降速度的影响,提出了新的沉降速度确定方法。研究表明:①海州湾近岸泥沙沉降速率大部分在0.05~2.50 mm/s之间,潮周期内泥沙絮凝体的沉降速度有明显变化。②含沙量较小时,泥沙絮凝体的沉降速度基本随含沙量的增加而增加;含沙量较大时,含沙量与沉降速度呈现出负相关,无论是大潮还是中潮,当含沙量达到0.7 kg/m^3左右时,絮团沉降速度最大,而随着含沙量的增大,絮团沉降速度开始减小。③在涨落潮垂线平均流速最大时刻,紊动强度达到峰值,含沙量较低时,随着紊动强度增加,沉降速度也随之增加,大潮期间紊动强度对泥沙沉降速度的影响高于中潮。④新的泥沙沉降速度计算公式不仅考虑了含沙量,还计入了紊动强度G,大大提高了沉降速度计算值与实测值的相关性。Based on the measured data of tidal current and sediment concentration in Haizhou Bay, the influence of turbulence intensity and sediment concentration on the settling velocity of offshore flocs is analyzed, and a new method to determine the settling velocity is proposed. Results show that ① most of the sedimentation rate of the offshore sediment in Haizhou Bay is between 0.05-2.50 mm/s, and the sedimentation rate of the flocs changes obviously in the tidal cycle. ② The sedimentation rate of the flocs increases with the increase of the sediment concentration when the sediment concentration is small;when the sediment concentration is large, the sediment concentration and sedimentation rate show a negative correlation.When the concentration of sediment is greater than 0.7 kg/m^3, the settling velocity reaches the maximum. Then, with the increase of sediment concentration, the settling velocity of flocs begins to decrease. ③ When the average vertical velocity of rising and falling tide is the maximum, the turbulence intensity reaches the peak value. When the sediment concentration is low, the settling velocity increases with the increase of turbulence intensity, and the effect of turbulence intensity on the settling velocity of sediment during spring tide is higher than that of middle tide. ④ The new formula not only considers the concentration but also the turbulence intensity G. The correlation between the settling velocity calculated by the new formula and the measured value is greatly improved.

关 键 词：沉降速度 紊动强度 含沙量 海州湾 

分 类 号：TV142.1[水利工程—水力学及河流动力学]