莱州湾东岸陆海相互作用与海岸缓冲区

提出了海岸缓冲区的概念。结合莱州湾东岸晚更新世以来陆海相互作用历史与近期变化,将海岸缓冲区分为古潟湖地貌限制型、开放型和人工海岸型3种基本类型,在横向上划分出3个缓冲带,对海岸缓冲区的结构与功能及缓冲区范围进行了研究。本研究对防范海岸带地质灾害、减轻灾害损失与海岸带资源与环境的可持续发展将起到积极的作用。

Research of LOICZ and the buffer area in the eastern coast of Laizhou Bay

The research on the LOICZ and the buffer area in the eastern coast,Laizhou Bay,three points were obtained.1 Buffer area of coastal zone The main idea of buffer area layout is to actualize effective projecting and controlling in the region of acute LOICZ,in order to harmonize the relations among population,resources and environment.The possibilities and feasibilities of coast zone programme are summed up in the following: ①The multi-environment in the Holocene（such as lagoon,billabong etc.） is the base of the coastal zone system stability. ② Sea water intrusion,coastal zone erosion and land degradation occurrence since the 1960s need to be prevented and controlled.③ The start of the Chinese Nature Foundation Item,"coastal zone eco-recovery research",marks the initiation of eco-recovery and rehabilitation.④ The intense LOICZ,concentrating in coastal zone,forms the core of buffer area which should be the focus of study and planning.2 The frames and functions of coastal zone There are archaic lagoons sandy coast,sandy coast of gentle deposits,artificial coast and estuarine coast which are generalized into three basic types: confined type of geomorphology in archaic lagoons,opened type and artificial coastal type.The opened type includes estuarine coast and deposit coast.The cross section of the coast is divided into three buffer belts.The belt Ⅰ lies between the low tidal line where only the greatest tide could arrive.Its function is to prevent the marine hydraulic action.The belt Ⅱ is from high tidal line to the farthest land affected most seriously by tide-storm in the history.This belt could mitigate the destruction caused by tide-storm and flood.And the belt Ⅲ extends to the distributing parts of the alluvium and diluvium of the mid Holocene and was mainly affected by hails,so relevant measures should be taken to reduce the loss of hail disaster.3 The boundary and dynamic process of buffer area It is the most important modality which interacts between fresh water and sea water.As a matter of fact,the transitional zone between fresh water and sea water was very wide in Chinese coast.Within the transitional zone,the main cations-exchange among water and rock occurred between Na⁺ and Ca²⁺,but K⁺is strongly adsorbed in mixed water.From coast into land,the Na⁺ and Mg²⁺were reducing and the Ca²⁺ was enriching and reached its extreme by the margin of the transition zone.The extent of the transition zone varied from 2 km to 4 km in Laizhou area,from 1.5 km to 3.5 km in Longkou area and from 1.5 km to 6.0 km as a whole.