Dr. Zhenhua Chao Profile

Dr. Zhenhua Chao

Teacher at Nantong Univ

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Proceedings Article | 8 November 2014 Paper

Study on soil erosion in Hudan River basin based on TM imagery

Zhenhua Chao, Yongshun Yang, Xiaohong Gao

Proceedings Volume 9260, 92602S (2014) https://doi.org/10.1117/12.2068654

KEYWORDS: Vegetation, Soil science, Remote sensing, Landsat, Agriculture, Visualization, Environmental monitoring, Natural disasters, Lithium, Earth observing sensors

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Huangyuan county is located in the eastern part of Qinghai province and is the transition zone of Loess Plateau and Qinghai-Tibet Plateau. While the ecological environment in Huangyuan county is fragile and is mainly characterized as serous soil erosion, frequent natural disasters. It is very important to study the soil erosion. Hudan river basin was selected to study the soil erosion in Huangyuan county. The soil erosion information was extracted from Landsat 5 TM data in 1987, 2000 and 2010. To classify and grade soil erosion was according to the classification standard, Classification Standard for Soil Erosion, issued by the Ministry of Water Resources of the People’s Republic of China. The types of soil erosion in the basin were classified as water erosion, freeze-thaw erosion and engineering erosion based on TM imagery, field survey and historical data. Water erosion was the most important part and accounted for more than 90% of the whole area. Weak water erosion increased significantly during the period, mainly distributing in the north of the basin. Slight-degree water erosion increased from 1987 to 2000, while there was a steep reduce during the period from 2000 to 2010. Freeze-thaw erosion distributed mainly in northern areas with high altitude. What Engineering erosion affected were narrow valley areas suitable for human settlements and agricultural production.

Proceedings Article | 11 January 2007 Paper

Comparison of the extracted DEMs in Heihe River upper and middle reaches

Zhenhua Chao, Zhuotong Nan, Xin Li, Zhihua Mao

Proceedings Volume 6411, 64111B (2007) https://doi.org/10.1117/12.693966

KEYWORDS: Data acquisition, Data modeling, Remote sensing, Satellites, Software development, Image resolution, Lithium, Infrared imaging, Thermography, Infrared radiation

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The Digital Elevation Model (DEM) are terrain elevations at regularly spaced horizontal intervals, i.e., an a grid of regularly spaced elevations. With the development of computing technology, the methods of data acquisition, data storage and data processing speed for DEMs get along well. Heihe river lies in the northwest of China and is a continental river. It roots from snow-ice and disappears in deserts. The drainage area is about 140,000 square kilometers and the river is the main water source for the living. The upper reaches are mountainous and the runoff is very important. The middle reaches are oasis. At present, many hydrological and ecological models are introduced. The catchment basin and stream network data acquired from DEMs are main input data for many surface hydrological models. So the quality and resolution of DEMs are significant. Software ENVI Version 4.2 furnishes with the DEMs Extraction Module. The paper compared several methods for extracting DEMs of the upper reaches. We extracted the elevation data from the ASTER---stereo images with the module and created the DEM. Secondly; we collected the DEM based on the contour map of Heihe river. The comparison of the DEMs quality was carried out between the DEM from the contour map, the DEM extracted by ENVI Version 4.2. To a certain extent, the DEM from Aster imagery can reflect the terrain and be used in hydrological models.

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