Study On Evolution Of Boundary River Of China And North Kprea

The change of river resources not only affects the ecological environment of riverside,but also closely related to the interests of people on the border.More importantly,this will affect the change in the land area of the two countries and the territorial sovereignty of the two countries.In recent years,some of China's border river basins in China due to human factors,that is,the impact of natural factors,the river is subtle changes in the occurrence,especially in the river erosion erosion serious areas,is likely to cause our country invisible loss of land,damage to national and national interests,Aggravate the instability of land use of river banks,is not conducive to the construction of land security.In this study,the spatial information technology was used to study the diversion of the middle and lower reaches of the Tumen River in the Sino-Korean border.The study was divided into three sections of Hunchun,Tumen and Longjing sections,and the influencing factors of river diversion were analyzed.In this study,the remote sensing images between 1910 and 1980 and the four remote sensing images between 2001 and 2016 were used as data sources to extract the water bodies,river islands and sandbanks in the study area by automatic computer extraction and artificial visual interpretation,Using the supervision classification to extract the land use situation in the study area.This paper analyzes the law of river course change from 1910 to 1980 and the change law of river course in 2001-2016,and discusses the influencing factors of river channel utilization by using riverbed land use information and collected climatological data,topographic data and field investigation data.The main contents and results are as follows:1)The Change of River in 1910-1980 Using the topographic maps of the last decade and the 1980s,the length of the riverline shows a decreasing trend in the middle and lower reaches of the Tumen River in 70 years.While the river sandbar and island area also showed a change in the law.2)The Change of River in 2001-2016The study shows that the river area and the average coastline are reduced,the length of the central shoreline is increased and the length of the shoreline is reduced,and the coefficient of zoning is reduced.The siltation area of the two countries has been reduced by using the four remote sensing images in the middle reaches of the 21st century.The erosion area is mainly along the island,the downstream North Korean silt area suddenly increased,far greater than China,the location of the two countries are still mainly along the river bank siltation.3)Analysis of Change FactorsThe changes of river are mainly affected by natural factors including topography,slope,temperature,precipitation and river hydrological factors,as well as human factors including land use(LUCC),flood protection and flood prevention dam construction and natural resource excavation.The change of the change of the erosion and the change of the siltation gradually weakened with the elevation of the elevation,and the change of the three-trending river is all greater than the erosion intensity,More than 200m,changes in erosion area and the change of the area of siltation is undulating,elevation greater than 500m,erosion and siltation changes are relatively weak.The sedimentation change is more likely to occur in the area with lower altitude and slower slope than that of the erosion.The erosion rate of the river bed is higher than that of the river,and the erosion rate is more obvious.The difference in precipitation led to a positive correlation between the river area and the average river width.The total precipitation decreased and the erosion power of the river was weakened.The precipitation in the Huanchun,Tumen and Longjing section showed a decreasing trend,and the erosion change was weakened during the period of 2001 to 2011,and the period of 2006-2016 Erosion changes increase.The conditions of the river itself also have a certain impact on its changes,such as the lithology of the river bed and the erosion of the river bed rock and other characteristics and river sediment and river erosion and other changes are closely related to the river type will also affect the river changes.The riverbed of the Longhe section of the river is mainly composed of hard rock,and the Tumen River is mainly composed of hard rock and medium hard-hard rock,and the Huanchun River is mainly composed of loose deposits and weak-hard rock.During the period from 2001 to 2016,many of the woodlands were developed into dryland and Hunchun areas.Many wetlands were destroyed and developed into arable land,construction land,and the change of land use structure increased the chance of soil erosion.Tumen River in the middle and lower reaches of the river side of China has a total of 32 revetment works,and China's revetment works in the construction has been able to better protect our country's river shoreline from large erosion.The iron ore plant in the Tumen River has a certain influence on the change of the river channel.At the same time,although this part of the study has achieved some of the results,but due to data sources,research methods and content on some of the shortcomings in the future study should try to make up for deficiencies,carry out more in-depth study.