山东半岛北岸与南岸现代岸线差异及其影响因素

THE MODERN COASTLINES DIFFERENCES BETWEEN THE NORTHERN AND SOUTHERN SHANDONG PENINSULA

山东半岛北岸、南岸现代岸线差异显著，北岸岸线相对平直，沿岸海积砂体发育，海湾成因类型以次生海湾为主；南岸海积砂体不发育，海湾类型以原生海湾为主。造成这种差异的因素包括地质构造、地形、海水动力条件、全新世相对海面变化及其河流地貌响应等。

Here,the northern peninsulas coastline stretches from the Laizhou Bay to Shidao,while the southern peninsulas from Shidao to Huangdao.There are distinct differences between the modern coastlines along the northern and southern Shandong Peninsula.Along the relatively straight northern coastline,there are many coastal sand bodies and secondary bays(including tie bar bays and lagoons).Along the southern Shandong Peninsula,no great coastal sand bodies have formed but there are many big primary bays (including the rock erosion,tectonic and estuary bays).The origins,which have resulted in the coastline differences above,include the geologic structure,topography,marine dynamics,Holocene relative sea level change and its fluvial geomorphic response.The regional geologic structure has controlled(1) the coastline strike and outline along the southern,northeastern and northwestern peninsula and (2) the regional topographic dividing line close to the northern coastline.The two points above determined the characteristics of the river’s length,catchment area,longitudinal profile and sediment load,then determined the fluvial geomorphic response to the Holocene relative sea level change.On the other hand,the marine dynamic conditions are very different.The northern coast is of strong wave and weak tide type,while the southern coast is of weak wave and strong tide type.It is the differences above that have affected the coastal landform’s development in material and dynamics,then affected the coastline features.