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- Title
柴达木盆地沙丘移动的空间分异及对形态参数的响应.
- Authors
李建军; 焦菊英; 曹 雪; 白雷超; 陈同德; 严晰芹; 祁泓锟
- Abstract
Desertification and dune movement are two serious forms of land degradation, resulting in the destruction of grassland and farmland ecosystems. Sandstorm activities occur more frequently in the Tibetan Plateau of western China in recent years, particularly with the expansion of desertification. The Qaidam Basin is the largest intermountain basin located in the northwestern portion of the Tibetan Plateau. This basin is usually considered to be 'the region of Earth most similar to Mars', providing for a sound reference for the study of Mars aeolian geomorphology. However, it is still lacking the understanding of dune movement in the Qaidam Basin. Taking the transverse dunes (such as barchan dune) as the research objects, this study aims to clarify the spatial regionalization and response to morphological parameters of dune movement in the Qaidam Basin. Geo Eye, Quick bird and World View satellite images were utilized to measure morphological parameters and movement of 101 dunes using the Google Earth software. The main results were listed as follows:1)The average movement speed of dunes was between 0 and 23.53 m/a in the study area, with an average of 4.66 m/a, more than half of which was the medium speed (53.73%). The movement direction of the dune was between 53.52° and 150.06°, with an average of 104.13°, indicating a better agreement with the main wind direction. The average speed of dune movement slowed down spatially from northwest to southeast, but there was no obvious trend. Specifically, the fastest movement was found in the middle (5.22 m/a), followed by the northwest (4.84 m/a), the north (3.49 m/a), the southwest (3.35 m/a), and the southeast (3.27 m/a). The movement direction changed with the direction of the mountain range. 2)The movement of the dune was much slower as the volume of dune increased in the same environment. There was a very significant (P<0.01) exponential negative correlation between the movement speeds and morphological parameters of dune, such as the length of windward slope (R²=0.716), length of lee slope (R²=0.705), height (R²=0.545), width (R²=0.988), perimeter (R²=0.986), basal area (R²=0.955), whereas, a very significant (P<0.01) linear negative correlation with the coefficient of dune shape (R²=0.438), and a significant (P<0.05) positive linear correlation with the length-width ratio (R²=0.130). Therefore, more attention can be paid to the dune width in future studies using remote sensing images. 3)The dune movement was much slower as the wind speed decreased and the precipitation increased in the whole basin. Furthermore, the dune moved slowly under the great vegetation coverage in the southeastern basin. 4)Dense rivers blocked the dune movement and protected Golmud City, but the dune movement still posed great threats to the whole ecosystem. This finding can make a great contribution to the accurate understanding of sandstorm activities for regional town planning and protection in the national ecological security shelter zone on the Tibetan Plateau of western China.
- Publication
Transactions of the Chinese Society of Agricultural Engineering, 2021, Vol 37, Issue 7, p309
- ISSN
1002-6819
- Publication type
Academic Journal
- DOI
10.11975/j.issn.1002-6819.2021.07.038