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Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] The aims are to study the soil erosion characteristics of Longyang Gorge to Jishi Gorge in the upper reaches of the Yellow River from 2017 to 2021, reveal the contribution of vegetation in soil erosion prevention and control, and provide scientific and technological support for the rational implementation of vegetation soil and water conservation and ecological security protection in the upper reaches of the Yellow River basin. [Methods] The section from Jishixia Gorge to Longyangxia Gorge of the Yellow River was chosen as the study area, and based on CSLE modes, methods of using spatial interception and map algebra were adapted to obtain soil erosion and vegetation coverage in this region and the spatial-temporary variation of the prementioned data. [Results] On these basis, the contribution of the vegetation to conserving soil was assessed, and the corresponding results showed that from 2017 to 2021, slight erosion and light erosion were the predominant erosion intensities, and the corresponding erosion moduli were 21.329, 55.518, 23.394, 21.490, 21.650 t/（km-2·a）, respectively. [Conclusion] Additionally moderate and heavy erosion generally occurres in regions with sparse vegetation coverage, and regions suffering a slight erosion are generally characterized with high coverage, which verifies the role vegetation in reducing soil erosion. The vegetation can effectively reduce the occurrence of soil erosion. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Tropical Meteorology (1004-4965) is the property of Guangzhou Institute of Tropical & Oceanic Meteorology, China Meteorological Administration and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study is aimed to quantitatively analyze the observational data of various optical equipment at the observation station of the Tall-Object Lightning Observatory in Guangzhou (TOLOG), and also realize the on-site calibration of the lightning optical observation equipment in field tests. We adopted the plane calibration method and calibrated the six types of lightning optical observation equipment using a portable plane calibration target. The results showed that the shorter the focal length of the lens, the greater the distortion coefficient. In the image, the influence of radial distortion was also positively associated with the angle between the line of sight and the optical axis. The distortion of the edge of the lightning channel captured by fish eye lens would be more than 25%. After performing distortion correction on the lightning optical data collected by the Nikon SLR D7100 camera equipped with a Nikon 8 mm fisheye lens and a high-speed camera equipped with a Computar 8 mm wide-angle lens, we found that the total length of the lightning channel before and after image distortion correction differed by 12.89% and 4.45%, respectively. It showed that the distortion caused by the focal length and the type of lens had different effects on the lightning channel image. After distortion correction, however, the shape and length of the lightning channel obtained by different optical devices had a good consistency. This research provides a convenient method to eliminate the influence of optical system imaging distortion on the analysis of lightning channel characteristics. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Zhengzhou University (Natural Science Edition) is the property of Journal of Zhengzhou University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)