基于数值模拟与统计学方法的南黄海近岸沙脊与水道稳定性评价  

Evaluating the geomorphological stability of coastal sand ridges and tidal channels in the southern Yellow Sea using numerical simulation and statistical methods

作　　者：朱庆光[1] 倪文斐 高建华[1] 贾建军[3,4] 杨磊[5,6] 龚绪龙[5,6] 汪亚平[1] ZHU Qing-guang NI Wen-fei GAO Jian-hua JIA Jian-jun YANG Lei GONG Xu-long WANG Ya-ping(School of Geographic and Oceanographic Science, Nanjing University, Nanjing 210023, China Center for Environmental Science, University of Maryland, Cambridge 21613, USA State Research Centre for Island Exploitation and Management, Hangzhou 310012, China Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China Geological Survey of Jiangsu Province, Nanjing 210018, China Key laboratory of Earth Fissures Geological Disaster, Ministry of Land and Resources, Nanjing 210018, China)

机构地区：[1]南京大学地理与海洋科学学院,江苏南京210023 [2]University of Maryland Center for Environmental Science,MD Cambridge 21613,USA [3]国家海岛开发与管理研究中心,浙江杭州310012 [4]国家海洋局第二海洋研究所,浙江杭州310012 [5]江苏省地质调查研究院,江苏南京210018 [6]国土资源部地裂缝地质灾害重点实验室,江苏南京210018

出　　处：《海洋科学》2016年第8期119-128,共10页Marine Sciences

基　　金：国家自然科学基金(41376044);中国地质调查局地质大调查项目(1212011220005,1212011014002)~~

摘　　要：以南黄海江苏岸外辐射沙脊群为对象,基于已验证的该区域沉积动力学数值模型模拟近30 a（1979-2011年）的水下地形演化,计算辐射沙脊区域海底地形年际变化标准偏差,对沙脊和水道的地貌稳定性进行定量评估。研究发现,地形变化标准偏差愈小,地貌愈稳定;标准偏差愈高,地貌愈不稳定。定量地确定了南黄海辐射沙脊区域内沙脊与水道稳定性系数的时空分布,发现主要淤积区域位于沙脊周围,近岸沙洲有淤高的趋势;主要侵蚀区位于水道,沙脊间水道逐渐冲刷加深,如西洋水道和黄沙洋水道。本研究提出的基于海底地形年际变化标准偏差确定地貌稳定性评估方法,可为海岸陆架地貌稳定性研究、区域资源开发和环境保护等提供参考。This study establishes a geomorphological evolution model for the radial sand ridge system off the Ji-angsu coast. By calculating the standard deviation （std） of the inter-annual variability of terrain elevation data out-put from the model, a quantitative classification of geomorphological stability for the sand ridges and tidal channels is proposed. The relation between std and geomorphological stability shows that the higher the std is, the more un-stable the landform is, and vice versa. The results indicate that the major siltation areas are around the sand ridges, especially some nearshore sand banks, while the areas of major erosion are in the tidal channels between the sand ridges （e.g., the Xiyang Channel, the Kushuiyang Channel）. Based on the inter-annual variability std of the terrain elevation data, this quantitative analysis method for evaluating geomorphological stability shows potential for ap-plicability and is significant to geomorphological research, regional resource exploitation, and environment protec-tion on coastal continental shelves.

关 键 词：沙脊 潮汐水道 地貌稳定性 数值模拟 标准偏差 南黄海 

分 类 号：P737.2[天文地球—海洋地质]