The morphology of the beach backshore and foreshore at Huiquan Bay,Qingdao,China,is characterized by a single intertidal sandbar system with a spring tide range of 4.59 m.The beach was measured with a laser total stat...The morphology of the beach backshore and foreshore at Huiquan Bay,Qingdao,China,is characterized by a single intertidal sandbar system with a spring tide range of 4.59 m.The beach was measured with a laser total station of Leica TPS402.Contours of the beach were generated using data collected in March and November 2005.The survey method provided 2 mm measuring accuracy and 4-10 m horizontal spacing.The net accretion volume of the foreshore was about 11,215 m3 from March to November.After sand sculpture activity,the axis of the sand trough migrated onshore from about 3.5 m to 17.5 m on the foreshore beach in November.At the same time,the axis of the sandbar crest migrated onshore no more than 42.25 m on the northwest foreshore;and it migrated offshore no more than 23.75 m on the southeast foreshore.On the northwest and southeast foreshore beach,two strips of erosion areas with a thickness of 0-0.2 m appeared on the sandbar crest.Accretion occurred at the bottom of the sand trough with a thickness of ～0.2-0.6 m.The sandbar height decreased after sand sculpture activity,and it was no more than 0.7 m in March and 0.6 m in November.Human activities,such as sand digging on the sandbar crest during sand sculpture activity,also can disturb the beach morphology of intertidal bar systems.This phenomenon also was validated by comparison of beach morphology,the results of a color artificial tracer experiment and a sediment transportation trend prediction.展开更多
Investigation of a beach and its wave condi-tions is highly requisite for understanding the physicalprocesses in a coast. This study composes spatial andtemporal correlation between beach and nearshore pro-cesses alon...Investigation of a beach and its wave condi-tions is highly requisite for understanding the physicalprocesses in a coast. This study composes spatial andtemporal correlation between beach and nearshore pro-cesses along the extensive sandy beach of Nagapattinamcoast, southeast peninsular India. The data collectionincludes beach profile, wave data, and intertidal sedimentsamples for 2 years from January 2011 to January 2013.The field data revealed significant variability in beach andwave morphology during the northeast （NE） and southwest（SW） monsoon. However, the beach has been stabilized bythe reworking of sediment distribution during the calmperiod. The changes in grain sorting and longshoresediment transport serve as a clear evidence of thesediment migration that persevered between foreshoreand nearshore regions. The Empirical Orthogonal Function（EOF） analysis and Canonical Correlation Analysis （CCA）were utilized to investigate the spatial and temporallinkages between beach and nearshore criterions. Theoutcome of the multivariate analysis unveiled that theseasonal variations in the wave climate tends to influencethe bar - berm sediment transition that is discerned in thecoast.展开更多
基金Supported by the CAS (Chinese Academy of Science) Pilot Project of the National Knowledge Innovation Program (No.KZCX-2-YW-212)the Natural Science Foundation of Qingdao City (No.04-2-JZ-109)the National Natural Science Foundation of China (No.40506015)
文摘The morphology of the beach backshore and foreshore at Huiquan Bay,Qingdao,China,is characterized by a single intertidal sandbar system with a spring tide range of 4.59 m.The beach was measured with a laser total station of Leica TPS402.Contours of the beach were generated using data collected in March and November 2005.The survey method provided 2 mm measuring accuracy and 4-10 m horizontal spacing.The net accretion volume of the foreshore was about 11,215 m3 from March to November.After sand sculpture activity,the axis of the sand trough migrated onshore from about 3.5 m to 17.5 m on the foreshore beach in November.At the same time,the axis of the sandbar crest migrated onshore no more than 42.25 m on the northwest foreshore;and it migrated offshore no more than 23.75 m on the southeast foreshore.On the northwest and southeast foreshore beach,two strips of erosion areas with a thickness of 0-0.2 m appeared on the sandbar crest.Accretion occurred at the bottom of the sand trough with a thickness of ～0.2-0.6 m.The sandbar height decreased after sand sculpture activity,and it was no more than 0.7 m in March and 0.6 m in November.Human activities,such as sand digging on the sandbar crest during sand sculpture activity,also can disturb the beach morphology of intertidal bar systems.This phenomenon also was validated by comparison of beach morphology,the results of a color artificial tracer experiment and a sediment transportation trend prediction.
文摘Investigation of a beach and its wave condi-tions is highly requisite for understanding the physicalprocesses in a coast. This study composes spatial andtemporal correlation between beach and nearshore pro-cesses along the extensive sandy beach of Nagapattinamcoast, southeast peninsular India. The data collectionincludes beach profile, wave data, and intertidal sedimentsamples for 2 years from January 2011 to January 2013.The field data revealed significant variability in beach andwave morphology during the northeast （NE） and southwest（SW） monsoon. However, the beach has been stabilized bythe reworking of sediment distribution during the calmperiod. The changes in grain sorting and longshoresediment transport serve as a clear evidence of thesediment migration that persevered between foreshoreand nearshore regions. The Empirical Orthogonal Function（EOF） analysis and Canonical Correlation Analysis （CCA）were utilized to investigate the spatial and temporallinkages between beach and nearshore criterions. Theoutcome of the multivariate analysis unveiled that theseasonal variations in the wave climate tends to influencethe bar - berm sediment transition that is discerned in thecoast.
