水科学进展2009，Vol.20Issue(4)：572-577,6.
开河期冰盖横向冰缝形成机理
Mechanism of transverse-crack formation during river-ice breakup
摘要
Abstract
During the river-ice breakup, the longitudinal cracks near banks are firstly formed due to the runoff increase, resulting in the detachment of central part of ice cover from both banks.Subsequently, as a result of horizontal bending or vertical bending of ice cover the transverse cracks will be further formed, and the continuous icE-cover is finally fractured into floes with cerain sizes.Based upon the theory and calculation method of elastic-foundation, the mechanism of transversE-crack formation is fully investigated.By means of studying on the bending moment and bending stresses of ice cover, the analytical expressions of the crack-spacing due to both horizontal bending and vertical bending are presented, and validated with the field measurements.The study indicates that the transversE-crack spacing depends on the icE-cover width, thickness, bending strength and topography.关键词
武开河/横向冰缝/冰坝/形成机理/冰盖Key words
mechanical icE-cover breakup/ transverse crack/ ice dam/ mechanical principle/ icE-cover分类
天文与地球科学引用本文复制引用
茅泽育,赵雪峰,胡应均,刘颖..开河期冰盖横向冰缝形成机理[J].水科学进展,2009,20(4):572-577,6.基金项目
国家自然科学基金的资助项目(50579030)The study is financially supported by the National Ntural Science Foundation of China(No.50579030) （50579030）
