| Jiuzihai-Heilongtan in the Lijiang Basin is located in the famous tourist scenic spot in Lijiang,Yunnan,and is also an important source of supply for Heilongtan,an important drinking water source in Lijiang City.In recent years,the cut-off of Heilongtan has aroused great concern from society,and it is urgently needed to clarify the reasons for its formation.However,because it is located in the famous scenic area in the east of the ancient city of Lijiang City,the traditional groundwater connection experiment is difficult to carry out.The groundwater migration law in this area and the cause of the Heilongtan outage have not been clearly revealed,which has seriously affected Lijiang as a world-renowned tourism the development plan of scenic spots.In addition,in the past,groundwater surveys and researches mostly used traditional ground surveys.However,due to the limitation of burial and exploration methods,groundwater migration and recharge are difficult to reveal systematically.Limited sources,insufficient exploration of image enhancement processing methods,and revealing the status of underground runoff movements have not been well deepened.In view of the urgent need to clearly reveal the actual needs of groundwater occurrence in the study area and the shortcomings of previous hydrogeological surveys,this paper uses remote sensing(RS)and geographic information system(GIS)technology,combined with the previous groundwater in Jiuzihai-Heilongtan spring area of Lijiang Basin Data,using Landsat8 OLI,ASTER,MODIS,GF and other satellite remote sensing data,focusing on strengthening remote sensing image processing and information extraction methods,focusing on inversion of groundwater-related surface temperature,inferring groundwater runoff path and flow direction;from focusing on strengthening fault structure.Translated to start,speculate on the occurrence of groundwater,carry out structural water control analysis,combined with field verification,and better reveal the groundwater migration law of Jiuzihai-Heilongtan spring area;based on the above knowledge,the cause of Heilongtan cutoff is inferred,Which provides a scientific basis for deepening the understanding of regional Heilongtan flow cutoff.The results achieved are as follows:(1)Based on Landsat8 satellite imagery,through the optimal index(OIF),edge enhancement processing and texture analysis,image fusion and other methods of comparative experiments,the extraction of the fault structure suitable for the Jiuzihai-Heilongtan spring area in the Lijiang basin Summarize the remote sensing image processing methods.(2)A comprehensive remote sensing interpretation of the fault structure in the Jiuzhai-Heilongtan area was added,and the groundwater control status was analyzed in conjunction with the known folds and fault structures in the study area.The major faults in the area,such as the Gudutang-Wenhua fault,the Ganhaizi-Jiuzihai fault,the Xinhuoshan-Bamaniu fault,the Laozhichang-Bamaniu fault,the Gantangzi-Wayao fault,etc.Remote sensing interpretation faults such as Xinxing-Jiuzihai fault,Dongbagu-Hailuogou fault,Xinxing-Lengmenshan fault,and analysis of structural water control characteristics were carried out.(3)Using Landsat8 TIRS and ASTER TIRS satellite sensors,based on the single window algorithm and split window algorithm to extract the surface temperature information in the study area,analyze the occurrence status and flow direction of groundwater in Jiuzihai-Heilongtan spring area It is speculated that there are mainly three belts for the occurrence and migration of groundwater in the Jiuzhai-Heilongtan spring area of Lijiang.The groundwater mainly flows from the northeast to the southwest from the west side of the Jiuzihai,and finally sinks into the Heilongtan big spring,showing a descending spring exposed surface Combined with the analysis results of structural water control characteristics,the groundwater flow status was further verified.(4)The reasons for Heilongtan's flow interruption are analyzed as follows:(1)In recent years,rainfall has decreased,karst depressions such as Jiuzhai in the middle of the study area,southeast Lariguang,and Hongshuitang in the east have dried up.Replenishment-The amount of karst water is greatly reduced.(2)From 1975 to 2016,the decrease of vegetation coverage and the increasing area of rocky desertification in the Jiuzhai-Heilongtan spring area have increased soil erosion and reduced water conservation capacity.(3)In the past 30 years,the continuous expansion of the urban area of Lijiang City and the development of tourism have led to a sharp increase in the use of groundwater,and further led to the cutoff of Heilongtan and the decline of the groundwater level. |
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