위성영상과 지형도를 이용한 북한 연백평야의 지형 변화 연구

Abstract

This study aims to analyze time-serially the change of geomorphic landscapes of Yeonbaek plain in Hwanghae Province, west coast of North Korea using comparison among 1961 and 1981 years? topographical maps, and 2002 year?s Spot satellite image. Coastlines have developed toward sea and simplified by reclamation projects of various scales from 1916 to 1981, but the changes have been not so much changes from 1981 to 2002 than earlier time, because of no great reclamation projects owing to the economic difficulty. In the Yeonbaek plain, many reservoirs and irrigation canals have developed order to overcome the geographical condition such that the basin has only short streams and a small amount of supply for the agricultural water. Coastal tidal flats were also changed so frequently and speedly according to changes of plain and coastal land cover and land use by various human impacts. The comparative analysis on tidal flat presents approximately that there were many flats having various scaled coast-tied and channel-island types in 1916 maps, but coast-tied flats were increased and channel-island flats were nearly disappeared. Some rivers and tidal channels have been straightened and connected to the reservoir and irrigation system. Abandoned or relict channels, separated by straightening of main river and tidal channels, may be used for irrigation reservoir. But, as a special case, Namdaeji of Yeonan county, traditionally famous big reservoir in Yeonbaek plain, have been reclaimed for cropland and other land use after 1920 years, and completely disappeared with remaining of more moisturized rice fields as evidence of ancient water body. The limitation of the study are using different grid systems among maps and impossibility of a field survey and checking work.