Oceanus.

v. 26, no. 4 (1983

Current status and formational mechanisms of coastal erosion on typical islands in China

A geological hazard survey of 82 islands in coastal China from 2010 to 2012, and subsequent periodic monitoring of coastal erosion on 10 representative islands from 2012 to 2014, found 138 coastal erosion points on 39 islands. Coastal erosion was a typical pattern of the coastal geological hazards, with the most serious impacts occurring on the southeastern coast of Chongming Island, the maximum erosion rate was 18.3 m/a under the conditions of sediment reduction and drastic hydrodynamic changes of the Yangtze river. The primary causes were changes in river dynamics, the marine hydrodynamic environment, and human activities, the specific factors included sea-level rise, river diversion, river-borne sediment reduction, wind-driven waves, storm tides, construction, coastal degradation, beach drainage, and sand mining. Natural and human factors accounted for 57 and 43 % of coastal erosion effects, respectively. Sea-level rise operated on a long-time scale, causing an annual mean shoreline retreat of 0.15 – 0.30 m, although such changes were not obvious over short time scales, they were significant at the decennial and centennial scale. Storm tides were among the most important factors operating over shorter time scales, although increasing human development of islands is rapidly becoming a significant cause of coastal erosion

Current status and formational mechanisms of coastal erosion on typical islands in China

825-837A geological hazard survey of 82 islands in coastal China from 2010 to 2012, and subsequent periodic monitoring of coastal erosion on 10 representative islands from 2012 to 2014, found 138 coastal erosion points on 39 islands. Coastal erosion was a typical pattern of the coastal geological hazards, with the most serious impacts occurring on the southeastern coast of Chongming Island, the maximum erosion rate was 18.3 m/a under the conditions of sediment reduction and drastic hydrodynamic changes of the Yangtze river. The primary causes were changes in river dynamics, the marine hydrodynamic environment, and human activities, the specific factors included sea-level rise, river diversion, river-borne sediment reduction, wind-driven waves, storm tides, construction, coastal degradation, beach drainage, and sand mining. Natural and human factors accounted for 57 and 43 % of coastal erosion effects, respectively. Sea-level rise operated on a long-time scale, causing an annual mean shoreline retreat of 0.15 – 0.30 m, although such changes were not obvious over short time scales, they were significant at the decennial and centennial scale. Storm tides were among the most important factors operating over shorter time scales, although increasing human development of islands is rapidly becoming a significant cause of coastal erosion

DIFFERENCES OF COASTALLINE CHANGES IN THE AREA AFFECTED BY LAND COVER CHANGES AND COASTAL GEOMORPHOLOGICAL SOUTH BALI 1995 - 2021

The South Bali coast is prone to abrasion due to its geographical position facing the Indian Ocean. High sea waves and currents in the south of Bali will erode beaches whose lithology and morphology are prone to abrasion. Land cover conditions that do not support coastal protection will also affect the high abrasion of the southern coast of Bali. This study aims to analyze the shoreline changes in South Bali from 1995-2021. The analytical method used is the Digital shoreline analysis system (DSAS), with data from Landsat 5 TM, Landsat 7 ETM+, Landsat 8 OLI/TIRS, and Sentinel 2A. The analysis results show that the area directly facing the waves is relatively high, with volcanic rock formations, and there is no mangrove as coastal protection. The lack of good coastal management shows the area with the highest abrasion. It was found in the western part of Tabanan Regency, eastern Gianyar, and southern Badung. Meanwhile, the average coastal accretion was relatively high in the neck of South Bali, in areas where the land cover was mangrove and adjacent to river mouths, which experienced much sedimentation

Delineation of Shoreline Change along Chilika Lagoon (Odisha), East Coast of India using Geospatial technique

Display contemplate zone is the Chilika Lagoon which is greatest salty water tidal pond in tropical Asia arranged in the Odisha east Coast of India. Current investigation of the shoreline change in the Chilika Lagoon utilizing the Landsat information relating to 1992-2014 is concentrate on the shoreline incline. Chilika Lagoon recorded the bigger shoreline morphology progression in the southern parts contrasted with alternate parts. The shorelines in towards offshore side uncover the bigger changes demonstrate the dynamic marine-fluvial progression are more grounded in this district. The examination additionally conceives the correlation of the consequences of the shoreline change rates completed utilizing EPR and LRR systems of DSAS. The aftereffects of the both the methods uncover practically comparable outcomes aside from the slight varieties in the scope of progress force. The scope of recorded by the EPR was - 91 to 210 m/y, though the LRR recorded - 50 to 144 m/y. The straight relapse strategy is helpless to exception impacts, and furthermore tends to think little of the rate of progress in respect to different measurements, for example, EPR. Similar outcomes were additionally delineated in give think about thought little of esteems by LRR contrast with EPR. Subsequently the EPR is the better alternative for the count of the net shoreline drift for the more drawn out period information

Monitoring the Coastal Environment Using Remote Sensing and GIS Techniques

The coastal zone has been of importance for economic development and ecological restoration due to their rich natural resources and vulnerable ecosystems. Remote sensing techniques have proven to be powerful tools for the monitoring of the Earth’s surface and atmosphere on a global, regional, and even local scale, by providing important coverage, mapping and classification of land cover features such as vegetation, soil, water and forests. This chapter introduced the methods for monitoring the coastal environment using remote sensing and GIS techniques. Case studies of port expansion monitoring in typical coastal regions, together with the coastal environment changes analysis were also presented

Geomorphological Changes by the Action of Coastal Processes and Anthropogenic Activties along the Coastal Zone between Ras Al-Jalaiah And Ras Az-Zour, Southern Kuwait

The coastline is one of the most important linear features on the earth s surface which displays a dynamic nature The natural processes that interact with the coastal environment of Kuwait are tides currents and waves The main shoreline of the coast of Kuwait is about 325 km long In the north the coast is characterized by wide intertidal mudflats bounded by a large-scale coastal sabkha partly covered with sand drifts The southern shore is characterized by relatively steep sand beaches with narrow to moderately wide rocky intertidal platforms which are partly covered by sand and algal mats The area of interest is the coastal area between Ras al-Julaiha and Ras Az-Zour in the southern area of Kuwait Sandy berm and wave-cut cliff bound this southern intertidal environment The study area is a superficial open vulnerable bay of a maximum depth of 28 m extending along the southern shore of Kuwait Ras Al-Jalaiah promontory bounds the area northwards and Ras Az-Zour promontory bounds it southward with a distance measured vertically of 18 085 k

Circulation, Vol. 20, No. 3

Summer 2015 issue of CCPO Circulation featuring article ODU-European Collaborations on Climate Change & Sea Level Rise Research by Dr. Tal Ezer.https://digitalcommons.odu.edu/ccpo_circulation/1000/thumbnail.jp