Correlation Characteristics of Mainland Coastlines and Spatial Utilization on Land and Sea Sides in China
The coastline is located at land-sea interaction zone,and its utilization pattern is closely related to the spatial planning on both sides of the coastline(i.e.,land and sea).This study primarily used the 2022 SDGSAT-1 satellite imagery and considered both the land and sea sides of the coastline to investigate the correlation characteristics of mainland coastlines and the spatial utilization on land and sea sides in China from the three levels:the entire coastal zone,the provincial(municipal)coastal zones,and the profile lines.The results show that:(1)The overall utilization ratio of the mainland coastline was high,with only 35.11%remaining undeveloped.Among the developed coastline types,aquaculture embankment coastlines accounted for the highest proportion,followed by port and dock coastlines;(2)In terms of land use,the largest area was utilized for construction purposes,with a significant proportion in Tianjin and Shanghai,followed by the artificial wetland area,with a high proportion in Liaoning and Shandong provinces.In terms of sea area use,fishery dominated in Shandong and Fujian provinces,marine transportation was most prominent in Shanghai,and the energy development accounted for a large proportion in Shanghai,Tianjin,and Hebei;(3)Regarding utilization intensity,there were clear positive correlations between the Index of Coastline Utilization Degree(ICUD),Index of Land Utilization Degree(ILUD),and Index of Sea Utilization Degree(ISUD).Especially,the correlation between coastline utilization and land use activities was relatively strong.Spatially,the regions with high and low values for the three indices were generally consistent.High-value regions were mainly distributed in northern regions such as Tianjin and Hebei,while low-value regions were predominantly found in southern provinces such as Zhejiang and Fujian;(4)Observing both land and sea sides from the coastline perspective,the landward side of unused coastlines was mostly covered by forests,with a lowest index of land utilization degree,while on the seaward side of unused coastlines,the proportion of tourism and recreational sea usage was relatively high.Port and dock coastlines exhibited the highest comprehensive indices on both land and sea sides.Construction lands dominated the landward side and energy development and transportation dominated the seaward side.The proportion of ecological protection sea usage on the sea side of aquaculture and salt embankment coastlines was relatively high.These findings provide scientific references and decision support for the scientific planning and management of coastlines,as well as the optimization of land-sea spatial structures.
mainland coastlineland and sea sidesland usesea area usecorrelated characteristicsSDGSAT-1 satelliteprofile lineChina
NETL
NSTL
万方数据
