渤海连续冰层关键力学参数预报模式  

Forecast model for key mechanical parameters of level ice sheet in Bohai

作　　者：李志军[1] 吴紫汪[2] 高树刚[3] 孟广琳[3] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [3]国家海洋环境监测中心,辽宁大连116023

出　　处：《大连理工大学学报》2003年第2期238-242,共5页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(49776278);中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室基金资助项目.

摘　　要：为反映海冰的物理和力学特性,利用实验室获取水平方向加载冰样的单轴压缩强度、三点弯曲强度和侧限剪切强度与孔隙率间的统计关系,把海冰温度、盐度和密度对强度的效应统一起来,建立了预报模式.之后,依据渤海海冰多年调查资料和近期研究成果,将冰层内的温度、盐度和密度表示成气温、水温和冰厚的函数,获得冰层的孔隙率剖面,进而得到冰层力学参数剖面.在选取冰层平均强度时还考虑了渤海冰层底部骨架部分有厚度无强度的特点,实现了利用已知冰厚、气温和水温预报冰层水平方向强度分布的目标.Sea ice is a temperature sensitive composite material with liquid, air and solid. Its physical and mechanical properties depend on the properties of the three components and their phase ratio. For showing these features, this model uses the experimental relationships of ice compressive strength, 3point flexural strength, confined shear strength with porosity of ice sample, and uniforms the ice temperature, salinity and density effects on ice strengths. From the historical investigation data and recent laboratory achievement, the ice temperature, salinity and density vertical profiles in ice sheet are expressed as a function of ice thickness, air temperature and water temperature. Therefore, the ice porosity profile and strength profiles are obtained. In the model of ice sheet strengths, the characteristic that Bohai ice skeleton has thickness and no strength is considered. This model reaches the aim of ice sheet strength forecast by using known ice thickness, air temperature and water temperature.

关 键 词：渤海 海冰 孔隙度 连续冰层 力学参数 预报模式 单轴压缩强度 侧限剪切强度 

分 类 号：P731.32[天文地球—海洋科学]