摘要
通过用无量纲分析和线性回归方法对2002-2003年太湖4测点1000多组波浪资料的分析,给出了太湖不同时段风浪平均波高(H)与风区长度(F)、水深(d)、风速(v)6个关系模式.在此基础上,开展了模式的误差分析及与前人模式对比.结果表明,太湖北部不同区域风浪平均波高的计算应选用不同计算模式,但是可用如下形式表示:其中,a1-a8为和地形及水生植物覆盖度等相关的参数.误差分析结果显示:离岸距离大于1km区域的参数a1-a8的取值分别为0.217456、1、0.15、0.6、0.09、0.6、1.0、0.0052,模式估算平均波高的误差小于24％;近岸区参数a7大于1,a8取0,a4取值介于0.6-0.72,a5介于0.00131-0.00168,模式估算平均波高的误差较大,表明近岸区波浪还需进行进一步的观测研究.
Wind wave is an extremely important hydrodynamic factor in shallow lakes. It has great influences not only on shipping, bank erosion and mixing of water, but also on sediments resuspension, light strength in water, dissolved oxygen and structure of e-cosystem. In addition, statistical analysis on the emperical wind-waves height models could help us understand more on the eutroph-ication and mechanism of algae bloom. Six models for the wind-wave height are set up by using least square method and non-dimensional analyzing of the observed wind-wave data (June-July, 2003 ) at 4 different sites, northern Lake Taihu. The deviations of the 6 wind-wave models from the observed data have been calculated. The conclusions are: 1) Models of wind-wave height (H) versus wind speed (v) , wind fetch length ( F) and water depth (d) are different in the littoral zone and in pelagic zone,but they could be expressed as where a1-a8 are 0.217456, 1, 0.15 , 0.6, 0.09, 0.6, 1.0,0.0052 in pelagic zone respectively. In the littoral zone a7 is greater than 1, a8 is 0, a4 is between 0. 6 and 0. 72, and a5 is among 0. 00131 -0. 00168. The deviation of the wind wave height mode in pelagic zone is less than 24% , which could be greater than 50% in littoral zones. So, the model of mean wind wave height from the observation in pelagic zone is invalid to calculate the wind wave height in littoral zone, and vice versa. It implies observations must be carried out in different zones for accurate wind-wave height models, especially in pelagic zone and the zone with macropla-nts.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2005年第1期41-46,共6页
Journal of Lake Sciences
基金
中国科学院知识创新项目(KZCX1-SW-12-Ⅱ)与中国科学院南京地理与湖泊研究所方向前沿项目联合资助.
