Remote sensing survey and driving force analysis of area change of Hongyashan Reservoir in the past twenty years
HAO Guzhuang1,2(), GAN Fuping3(), YAN Baikun3, LI Xianqing1,2, HU Huidong1,2
1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China 2. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; China Aero Geophysical Survey & Remote Sensing Center for Natural Resources, Beijing 100083, China;
Hongyashan Reservoir is located in northwestern China where water resources are lacking. Reservoirs are an important support for the ecosystem in this region. Analyzing the changes in the area of the reservoir can effectively help Minqin County Government to make overall plans for water ecological protection and restoration as well as rational use of water resources and can also provide support for its decision-making. Through the extraction and analysis of the water area and vegetation coverage of the Landsat series data and GF-2 data from 2000 to 2019 and in combination with the surrounding meteorological data and the collection of local data, the authors comprehensively analyzed the influencing factors of the water area change and explored the spatial and temporal changes of the water area as well as the driving force. The results show that, on the whole, the water area of Hongyashan Reservoir has continued to increase in the past 20 years, the total area has increased by 8.98 km2, and the area change rate is as high as 42.6%, and that, in terms of monthly changes, the change in water area has an inverted “normal distribution” curve. The trend is that the wet season is mainly concentrated in March and September-October in the spring and autumn seasons, and the dry season is mainly concentrated in June in the summer. In terms of interannual variability, the water area is greatly affected by the seasons, so it is divided into spring, summer, autumn and winter. Interannual analysis shows that the water area in spring and winter continues to rise, with average annual growth rates of 5.03% and 5.22%, the lowest average annual growth rate in autumn is only 2.42%, and the average annual growth rate of summer water area is 22.19%, which is the season with the largest variation amplitude, exhibiting “V” fluctuation and rising. According to the meteorological data such as temperature, precipitation and evaporation, the correlation analysis of vegetation coverage and water area, and the analysis of related hydrological data, the following conclusions can be drawn: the direct driving forces are the change in precipitation, the increasing project expansion, and the change of runoff into the reservoir, whereas the indirect driving forces include changes in temperature, changes in vegetation coverage, the industrial, agricultural and domestic water use, and the restoration of the ecological environment.
郝固状, 甘甫平, 闫柏琨, 李贤庆, 胡辉东. 红崖山水库近20年面积变化遥感调查及驱动力分析[J]. 国土资源遥感, 2021, 33(2): 192-201.
HAO Guzhuang, GAN Fuping, YAN Baikun, LI Xianqing, HU Huidong. Remote sensing survey and driving force analysis of area change of Hongyashan Reservoir in the past twenty years. Remote Sensing for Land & Resources, 2021, 33(2): 192-201.
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