广西北海海岸带典型监测剖面的蚀淤特征  

Characteristics of Erosion and of Typical Monitoring Sections of the Coastal Zone in Beihai, Guangxi Province

作　　者：张亮 崔振昂[1,2] 滕德强 ZHANG Liang;CUI Zhenang;TENG Deqiang(Key Laboratory of Marine Mineral Resource,Ministry of Natural Resources,Guangzhou 510760,China;Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 510760,China)

机构地区：[1]自然资源部海底矿产资源重点实验室,广州510760 [2]中国地质调查局广州海洋地质调查局,广州510760

出　　处：《河南科学》2019年第11期1833-1840,共8页Henan Science

基　　金：国土资源部海底矿产资源重点实验室开放基金（KLMMR-2014-A-08）;自然资源部中国地质调查局地质调查项目（DD20190308）

摘　　要：利用RTK和单波束测深仪对广西北海海域开展海底地形重复对比测量,进行海岸带侵蚀淤积监测,并在监测剖面上进行表层沉积物取样,获取沉积物粒度参数.高程测量结果表明,GXSY3监测剖面冬季潮间带高潮位滩面略有侵蚀,低潮位滩面及附近水下斜坡略有淤积,剖面北部处于侵蚀状态,监测剖面中部和南部有淤积趋势;GXSY4监测剖面西南部侵蚀,东北部处于淤积状态.沉积物粒度结果显示,GXSY3监测剖面冬季潮间带沉积物粒度变粗,潮下带北部的沉积物粒度变细,表现为粉砂组分较夏季有所增加、砂组分趋于减少,剖面南部较夏季粉砂组分减少、砂组分趋于增加;冬季GXSY4剖面潮间带组分含量基本不变,部分区域发生粒度变粗;潮下带砂组分含量降低,粉砂组分增加,粉砂组分增加,沉积物变细.监测剖面侵蚀淤积的因素主要与泥沙供给、水动力条件等季节变化有关,GXSY4组剖面还和航道疏浚密切相关.研究发现,利用CORS基站进行无验潮模式海岸带侵蚀淤积地质环境监测,数据具有较高可信度,具有较强适用性,提高工作效率,避免架设基站的繁琐,可以在以后调查和监测项目中推广使用.In July and December 2015,RTK and single beam depth sounder were carry out repeated comparison and measurement of the seabed topography in Beihai area of Guangxi,and the coastal erosion and sedimentation monitoring was carried out.Surface sediment samples were taken on the monitoring section to obtain sediment particle size parameters.Elevation measurement results show that GXSY3 monitoring section has a slight erosion of high tide beach in winter intertidal zone,and the low tide beach and nearby underwater slope are slightly deposition.The northern part of the section is in an erosion state,and there is a tendency of deposition in the middle and south part of the monitoring section.Erosion was observed in the southwest of the GXSY4 monitoring profile,and siltation was observed in the northeast.The results show that the sediment particle size in the GXSY3 monitoring section becomes coarser in winter intertidal zone.The sediment particle size in the northern part of the subtidal zone becomes finer,which indicates that the silt component increases and the sand component tends to decrease.In the south section,the composition of silt is reduced and the sand component tends to increase.In winter,the content of inter-tidal zone component of GXSY4 profile is basically unchanged,and the grain size becomes coarser in some areas.The content of sand component in the subtidal zone decreases,the composition of silt increases and the sediment becomes fine.The factors of erosion and deposition in the monitored profile mainly include the seasonal changes such as sediment supply and hydrodynamic conditions.The GXSY4 group profile is also closely related to the channel dredging.The RTK can be used for monitoring the erosion and siltation of geological environment in coastal zone supported by the CORS base station without tide gauge.The data has high credibility,strong applicability,improved work efficiency,avoided the tedious construction of base stations.It can be popularized to investigate and monitor projects in the future.

关 键 词：RTK 高程 沉积物 蚀淤 监测 广西 北海 

分 类 号：P714.7[天文地球—海洋科学]