基岩海岸剥蚀差异初探——以大连金石滩国家地质公园为例

Bedrock Coast Erosion Difference Study——A Case Study of Dalian National Geological Park

依托大连金石滩国家地质公园基岩海岸侵蚀地貌,通过对基岩海岸岩石和实验室石灰岩进行采样、称重、打磨并结合岩石产状、盐度、岸坡倾角的测量,分析了基岩海岸带岩石的剥蚀差异是由风化和侵蚀作用共同影响的.依据海蚀柱、海蚀崖、海蚀拱桥、海蚀平台、海蚀洞穴五种海岸侵蚀-溶蚀地貌,定性分析了基岩海岸剥蚀差异是由岩性、岩石产床、构造节理的差异而产生;利用一元线性回归方程定量分析了影响剥蚀差异的主要控制因素:盐度变化和岸坡倾角与岩石失重的相关性.两者与岩石失重相关度分别为R1=0.644,R2=0.835.将野外采样岩石样本和实验室石灰石样本失重量进行比对,讨论了不同采样区岩石失重差异的原因是岩性与产状;实验室石灰石失重差异的原因是岩层产状、盐度变化、岸坡倾角的不同.

Relying on bedrock coast erosion of Dalian Golden Pebble Beach National Geological Park, through sampling,weighing and grinding of the bedrock coast limestone rocks and laboratory limestone, and combined with the rock occurrence, the measurement of salinity and bank slope angle, we concluded that the bedrock erosion difference of coastal zone ofthe rock is affected by weathering and erosion. According to the sea stack, marine cliff, abrasion arch bridge, marine platform, sea caves-five kinds of coastal erosion-corrosion landform, we concluded that the bedrock coast erosion＇s differencesare caused by lithology, rock production bed, as well as the differences between the structural joints.. We used monadic linear regression equation to quantitatively analyze the main control factors affecting the denudation differences： the relevance of salinity changes and slope angle and rock weight loss. Both of the relevance with rock weight loss are R1=0.644 and R2=0.835, respectively. The weight loss of field samples and laboratory limestone rock samples were compared and concluded that the reason for the difference of the weight loss between the sample from different area was lithology and occurrence; the difference of weight loss between laboratory limestone was caused by different rock occurrence, salinity, bank slope angle.