Mr. Junde Wang Profile

Junde Wang

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Proceedings Article | 16 May 2024 Paper

Research on evolution of Western Han Dynasty water basin based on LUCC and NDVI

Ting Yang, Yufei Cheng, Junde Wang, Jing Ma

Proceedings Volume 13166, 131660L (2024) https://doi.org/10.1117/12.3029332

KEYWORDS: Vegetation, Remote sensing, Matrices, Analytical research, Temperature metrology, Geographic information systems, Climate change, Reflection, Spatial analysis, Landsat

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In order to quantitatively identify the evolution of the runoff time and space of the basin, analyze the factors affecting the changes in the hydrological situation of the basin. This article uses the Western Han Dynasty Water Basin as the research area. Based on remote sensing technology, the impact of LUCC and NDVI changes on the runoff of the area. Firstly, the method of time and space evolution of the elements of various elements in the research area of the research area was analyzed by methods such as Mann-Kendall. Period (1990 to 2020) Vegetarian coverage (NDVI) transferred in space. The results show: (1) From 1960 to 2022, the runoff in the West Han River Basin showed an overall downward trend. From north to south, the runoff in the basin showed an increasing trend of 2.68×10⁸m³, 7.55×10⁸m³, and 12.99×10⁸m³ . The mutation years were concentrated in the 1980s and 1990s. (2) From 1980 to 2020, precipitation in the basin generally showed a slow upward trend in time, and spatially showed an increasing trend from upstream to downstream; temperature changes showed a consistent upward trend with the same increase in time, and spatially showed that the temperature in the upstream was lower than that in the downstream , consistent with global temperature changes. (3) The transformation of LUCC in the West Han River Basin from 1980 to 2020 was mainly due to the increase of forest and grass area and the decrease of cultivated area. (4) The NDVI in the West Han River Basin from 1990 to 2020 was at a medium to medium high level in the time series, and showed an overall upward trend. In terms of spatial distribution, the pattern of "downstream is better than upstream", and the vegetation cover was significantly improved, but contrary to the change of runoff, the increase of NDVI had a decreasing effect on runoff.

Proceedings Article | 30 August 2023 Paper

Comprehensive influence of water resources development and utilization on ecological environment in Taohe River basin

Jing Ma, Yufei Cheng, Junde Wang, Ting Yang

Proceedings Volume 12797, 127971L (2023) https://doi.org/10.1117/12.3007421

KEYWORDS: Remote sensing, Environmental sensing, Matrices, Environmental monitoring, Analytical research, Landsat, Reflection, Environmental management

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In order to explore the impact of water resources development and utilization on the ecological environment of the Taohe River Basin and coordinate the relationship between water energy development and ecological environment protection, this paper analyzes the impact of water resources development and utilization on the ecological environment of the Taohe River Basin by using the data of runoff, sediment, land use types and remote sensing ecological index for many years. The results show that: 1) After the construction of hydropower station, the proportion of runoff in flood season is relatively reduced, while the proportion in non-flood season is relatively increased; the water quantity decreased in summer and autumn and increased in winter. 2) The silt of Taohe River mainly comes from flood period, and the sediment transport in summer is the largest, up to 82.26% of the annual sediment transport; the sediment transport showed a decreasing trend from 1991 to 2021. 3) During the 40 years from 1980 to 2020, the transfer area of grassland, forest land and cultivated land in the Taohe River Basin has been changed to some extent, but the small difference between the area transferred in and the area transferred out, resulting in the overall change of land use types area in the study area during this period was not large. 4) The RSEI ecological index in the Taohe River Basin from 1990 to 2020 was at a medium level, but showed an overall upward trend; the spatial distribution shows the pattern of "upstream is better than downstream", and the areas with poor environmental quality are concentrated in the downstream areas.

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