Bulletin of Surveying and Mapping ›› 2023, Vol. 0 ›› Issue (10): 7-13,33.doi: 10.13474/j.cnki.11-2246.2023.0288

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Analysis of area change and driving forces for the Eling Lake at the source of the Yellow River

LI Na1, WANG Lin1, WEN Guangchao2, WANG Junlei3, WU Yinwen1   

  1. 1. School of Transportation Engineering, Huanghe Jiaotong University, Jiaozuo 454000, China;
    2. School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China;
    3. Henan Yellow River Survey Information Engineering Institute, Zhengzhou 450004, China
  • Received:2023-04-10 Revised:2023-08-31 Published:2023-10-28

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Abstract: Lake is one of the important structures that constitute the ecosystem.Exploring the changes of the area of Eling Lake at the source of the Yellow River and analyzing its driving factors can provide theoretical basis and technical support for the ecological protection and environmental governance of the Yellow River Basin.Combined with meteorological,vegetation coverage,land use types and other factors,a series of Landsat remote sensing images from 2001 to 2020 are selected to carry out the analysis and research on the area change of Eling Lake and its driving force by using NDWI,Mann Kendall test,Pearson correlation analysis and other methods.The results show that the average area of Eling Lake from 2001 to 2020 is 639.10 km2,the maximum value is 676.28 km2 in 2012,and the minimum value is 595.92 km2 in 2001.The change of lake area has roughly gone through four stages: stability period (2001—2004),expansion period (2004—2012),contraction period (2012—2017) and expansion period (2017—2020),showing an overall expansion trend.In space,the area change in the southwest of Eling Lake has been the most obvious in the past 20 years,with an area expansion of 20.41 km2 compared with the previous year in 2018.During the shrinking period of the lake,the lake boundary in the southwest region shows a trend of continuous contraction.The changes in basic geological conditions and meteorological conditions are the main reasons for the change in the area volume in the southwest region.According to the correlation between various factors and lake area,the driving factors of the area change of Eling Lake from 2001 to 2020 can be ranked as follows: precipitation>temperature>vegetation coverage>evaporation>land use type.Rainfall and temperature are the main influencing factors on the changes in the area of Eling Lake.

Key words: Eling Lake, the Yellow River Basin, NDWI, driving force

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