摘要
该理论模式将湖、海岸坡上的波场冲积物置于波场和重力场的耦合作用中。该区带地貌剖面在坡度和坡形上的响应性变化,使冲积物在其向、离岸振荡运动中形成振距耦合均衡势,与此同时,导致相对稳定的动力地貌均衡剖面的形成。本文提出耦合均衡的含义、条件及其均衡坡度θ_e和坡度梯度的表达式。该理论模式对认识湖、海岸环境中有关岸坡发育问题有一定意义。
The sediment s moving on-off shore in wave field on lake-sea submarine slope are coupled by wave and gravity field. The net on-off shore displacement of the sediments leads to the changing of submarine morphological profile in slope and the gradient of slope. This is a morphological response process to external agent. The condition of coupling equilibrium profile is:There is an approximate relation between gradient of the slope in equilibrium (θe) and asymmetrical gradient of the oscillating motion of sediments along the submarine shore slope.where,Ss- net displacement of sediment in a period of wave;△S——net displacement of sediment in a period of wave in the direction perpendicularto shoreline; β-angle between displacement vector of sediment and the shoreline in a period ofwave;△Sa——angle between incident wave and shoreline; S-distance of sediments displacement caused by the gravity along the slope in halfperiod of wave;△Ss+——distance of onshore displacement of sediment caused by wave; △Ss-——distance of offshore displacement of sediment caused by wave; R——coefficient(>0)
出处
《湖泊科学》
EI
CAS
CSCD
1995年第2期127-132,共6页
Journal of Lake Sciences
关键词
岸坡
地貌发育
耦合均衡理论
海岸
Submarine slope, couple fields,geomorphological equilibrium
