Analysis On The Recession Characteristics Of Lake In Daqing City

Lakes in Daqing city are an important guarantee for the development of agriculture and animal husbandry economy and the ecological environment in Daqing region,and also an important part of the water environment in Daqing city.The protection of lakes in Daqing city play s an effective regulating role for the improvement of natural environment and water environment in Daqing city.In recent years,Daqing municipal government has been developing economy vigorously,ignoring the importance of protecting the environment and neglecting the function of the environment,which has caused serious environmental problems.Only when the environment is protected can the goal of scientific development be achieved.In this regard,through the study of Daqing lake and its dynamic changes in 34 years,this paper provides a strong scientific theory for the protection of the lake by Daqing government and other governments at all levels.The protection of the lake plays a vital role in achieving the harmonious coexistence between man and nature.The main purpose of this paper is to analyze the area change and its influencing factors of Daqing lake from 1984 to 2018 through remote sensing technology and geographic information technology,to deeply discuss the causes of specific lake degradation in Daqing city,and to provide database support for regional agricultural production and ecological environment construction.In this paper,research methods based on Landsat TM(Thematic Mapper),ETM+(Enhanced Thematic Mapper Plus),OLI(the Operational Land Imager)and China's environmental resources satellite(HJ,Huanjing)for remote sensing image,using eognition software adopts object-oriented classification method to extract lake distribution information from 1984 to 2018,at the same time,a time period for five years.For lakes degradation situation,combined with 1984,1998,Landsat 5TM remote sensing image,2003,2008 Landsat7 ETM images,2013,2018 Landsat8-the image of OLI,according to the data by lake dynamic attitude and rate of change,landscape fragmentation pattern of the center of mass change,spatial autocorrelation analysis and lakes and other research methods combining with the driving factors of meteorological data in Heilongjiang province,population,social and economic data such as data based on remote sensing and information data processing and quantitative analysis,In-depth analysis of lake area change and degradation process in Daqing.The results show that the area of the lake increased and then decreased from 1984 to 2018,and the total area of the lake has decreased by 522km~2.The lake area has been seriously degraded.The accumulative surface water area of Daqing city is 6929.34km~2,the surface water area of Daqing city in the state of reduction is 4485.20km~2,and the overall surface water area of Daqing city in the state of growth is 1761.29km~2.The dynamic attitude and change rate of lakes in Daqing city are on the rise and the lake degradation is more and more serious.Daqing lakes of centroid movement speed present decreasing trend,the overall movement speed is in decline,also show that lake degradation degree gradually stabilized,Daqing lakes on the aspects of landscape fragmentation is the overall change is bigger,in the research on the time period of Daqing lakes are positively related to the space represent,but also reflect the Daqing lakes in space is not a random distribution,present a space gather and gather each other in the same area.During the period from 1984 to 1998,great changes took place in gathering area,mainly in the western region of Zhaoyuan county,the western and northern regions of Datong district,and the western region of duerbert autonomous county.At the same time,the low-low aggregation area has relatively little change,mainly concentrated in the southeast of Zhaoyuan county,Longfeng district,Honggang district and Zhaozhou county.Through the analysis of the factors affecting the degradation of Daqing lake,it is concluded that the most important factors are social factors,followed by natural factors and human activities.