| 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θe和坡度梯度?θe/?x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。 |
| 关键词: 冲积物岸坡 波场-重力场耦合 地貌均衡剖面 |
| DOI：10.18307/1995.0204 |
| 分类号: |
| 基金项目: |
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| Basic characteristics and significance of coupled equilibrium theory in submarine slope morphologic development |
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Cui Chengqi, Yin Ping
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Ocean University of Qingdao, Qingdao 266003
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| Abstract: |
| The sediments 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:ΔS1=ΔS2cosβ=0 ΔS3=±[(S4+-S5-)2-4S6(S7+-S8-)sinα+4S62]1/2 β=arctg[tga-2Sq/(Sa+-Sa-)cosα] There is an approximate relation between gradient of the slope in equilibrium (θe) and asymmetrical gradient of the oscQlating motion of sediments along the submaxine shore slope. ?θe/?x=?(Sa+-Sa-)/?x·R where, Sa——net displacement of sediment in a period of wave; Sax——net displacement of sediment in a period of wave in the direction perpendicular to shoreline; β——angle between displacement vector of sediment and the shoreline in a period of wave; α——angle between incident wave and shoreline;Sq——distance of sediments displacement caused by the gravity along the slope in half period of wave; Sa+——distance of onshore displacement of sediment caused by wave; Sa-——distance of offshore displacement of sediment caused by wave; R——coefficient (> 0) |
| Key words: Submarine slope couple fields geomorphological equilibrium |
