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Meteorological Causes of a Severe Pollution Weather Process in Shaoyang Area
摘要: Based on THE monitoring data of air quality and conventional meteorological data in Shaoyang City, a severe pollution weather process in Shaoyang from December 25, 2023 to January 1, 2024 was analyzed from the aspects of changes in pollutant concentration, circulation background, and changes in various meteorological elements. The results show that this severe pollution weather process was a compound pollution process caused by accumulation of local pollutants and transportation of external pollutants, during which the primary pollutant was PM2.5. During the accumulation stage, the ground was controlled by a uniform pressure field, and the conditions of atmospheric diffusion were poor. During the outbreak stage, the wind on the ground was from the northeast, which was conducive to the input of upstream pollution clusters into the city. Pollutant concentration was inversely correlated with daily average sea-level pressure, and positively correlated with daily average temperature. Wind speed and direction were closely related to PM2.5 concentration. During the accumulation stage, the ground was mainly dominated by weak winds, and the conditions of atmospheric diffusion were poor. During the outbreak stage, the continuous northeastward wind continuously transported upstream pollutants to Shaoyang area. Local pollutants accumulated in the previous stable weather process and the terrain led to the outbreak of local pollution.
关键词: Heavy pollution process; Pollution characteristics; Causes; Meteorological elements
Construction Model of First-class Undergraduate Courses in Local Universities from the Perspective of New Liberal Arts: Based on the Reform Practice of the "Finance" Course at Yangtze University
摘要: Against the dual background of deepening the construction of new liberal arts and implementing the "Double Ten Thousand Plan" for first-class undergraduate courses, local universities urgently need to explore distinctive curriculum construction paths. Based on the requirements of the new liberal arts connotation, this paper constructs a three-dimensional integrated framework of "value guidance, ability driven, and knowledge foundation", and takes the construction of the "Finance" course at Yangtze University as a typical case for research. When systematically analyzing the "Finance" course in the school, a three-dimensional integrated curriculum reform practice is implemented by reshaping the three-level curriculum objectives of "state-society-individual", developing teaching content that integrates "modularization-localization-cutting-edge", using the "O-PRAISE" situational teaching method, and constructing a diversified collaborative evaluation system. A first-class curriculum construction model for local universities has been summarized, which involves five collaborative approaches: “localization” of target positioning, “integration” of content construction, “contextualization” of method implementation, “value-added” evaluation orientation, and “synergy” of resource guarantee. The aim is to provide theoretical paradigms and practical solutions for similar universities to learn from, effectively solving practical difficulties such as the disconnect between value shaping and knowledge transmission, and the mismatch between talent cultivation and local needs in curriculum construction.
关键词: New liberal arts; First-class courses; Local universities; 3D integration; Five-bit synergy
Characteristics of the Rainstorm Weather System Causing Flood in the Jianjiang River Basin
摘要: Based on the meteorological observation data from 1994 to 2023, the spatiotemporal distribution characteristics and periodic changes of extreme precipitation were analyzed. The extreme precipitation showed a fluctuating upward trend, and reached a peak of 713.5 mm in 2010. The frequency of events increased from 7 times in 1994-2000 to 56 times in 2020-2023, with significant periodicity of 3-4 and 7-8 a. In terms of spatial distribution, the precipitation intensity in the upper reaches was significantly higher than that in the middle and lower reaches, reaching 421.6 and 405.7 mm respectively. The lowest was in downstream Wuchuan City (268.3 mm), showing a decreasing trend from upstream to downstream. Extreme precipitation was mainly concentrated from July to October, especially in September (accounting for 25.8%). Typhoon was the main cause, with 80% of the TOP10 records related to typhoons, and the average precipitation intensity of typhoons reached 501.6 mm. The average precipitation intensity from 2020 to 2023 reached 442.8 mm. The correlation coefficient between 12-h rainfall intensity and flood level was 0.85, and the accuracy of flood warning based on rainfall intensity threshold was 78%, which had guiding significance for flood control and disaster reduction.
关键词: Extreme precipitation; Spatiotemporal distribution; Periodicity; Typhoon; Jianjiang River basin