Subjects: Geosciences >> Geography submitted time 2023-02-27 Cooperative journals: 《干旱区地理》
Abstract： Research on the evolution characteristics of loess erosion and the development of watershed geomorphic systems in the Loess Plateau of China is a hotspot in the study of loess landforms, and many related scientific issues still need to be studied. Most previous studies have focused on the erosion and development characteristics of watershed geomorphology, but there is a lack of research on indepth analysis of the geomorphic evolution characteristics of loess small watersheds with multiple rock and soil layers in the field from the perspective of watershed geomorphology system and its potential energy information entropy (PEIE). Therefore, based on the viewpoint and method of system theory, mathematical models of the geomorphic system and its PEIE of a small loess watershed with multiple rock and soil layers were built. Taking the Xindiangou small watershed at Suide County, Shaanxi Province, China as the research sample area, the digital elevation model data of 5 periods from 2000 to 2019 were used to investigate the entropy change law of the PEIE and the characteristics of landform evolution in the watershed. The results show that from 2000 to 2019, the geomorphic evolution process dominated by loess erosion in the Xindiangou small watershed is the process of entropy reduction of its PEIE and continuous erosion of the loess landform. Combined with the entropy change of PEIE in the Xindiangou small watershed and the indoor small watershed, it is speculated that the watershed geomorphic system will form a W-shaped PEIE change curve in its complete geomorphic evolution process, and its PEIE can better indicate the watershed geomorphic development demarcation points in its infancy, maturity, and old age. The research results also confirm the effectiveness of the conceptual model of the loess watershed geomorphic system and its mathematical model of PEIE in the numerical simulation of the Xindiangou small watershed. This model is an extension of the existing mathematical model of PEIE of watershed geomorphic systems with homogeneous single loess layers, which can be used in heterogeneous multiple rock and soil layer loess watershed geomorphic systems and has wider applicability. The research results provide ideas for further research on the geomorphic formation mechanism and evolution law of the Xindiangou small watershed in the future and guide soil and water conservation, ecological restoration, and regional sustainable development of the Xindiangou small watershed, which has important theoretical significance and good application prospects
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2019-08-02 Cooperative journals: 《干旱区地理》
Abstract：基于室内人工降雨试验条件下获取的黄土坡面侵蚀的九期DEM数据，计算出不同演化时期黄土坡面的坡度、坡向及沟道网络，利用等分坡度直方图、等分坡向玫瑰花图和沟道分级网络对坡面侵蚀变异特征进行研究，并初步分析了该变异特征与黄土坡面侵蚀和演化过程之间的关系。结果表明：在黄土坡面侵蚀过程中，该坡面的坡度离散程度在逐步增加后基本保持稳定；其主导坡向总体呈现逐步有序化的变化特征，由多个主导坡向逐步演化为与该坡面主干沟道总体走向基本一致的一个主导坡向；其沟道网络逐步发育成典型树状网络并基本保持稳定，且形成了完整和严密的沟道等级结构。上述侵蚀坡面变异特征在一定程度上反映出该坡面在发育初期侵蚀较为强烈但在后期强度有所减弱。本研究是对黄土侵蚀坡面变异特征的初步探索，对未来进一步揭示黄土坡面的侵蚀机理和演化规律具有重要理论意义。
Subjects: Civil Engineering and Building Construction >> Civil Construction Engineering submitted time 2017-12-05 Cooperative journals: 《土木建筑工程信息技术》
Abstract：为了改变施工企业内部档案传统纸质存储、手工操作的档案服务模式，开发了一种基于web的档案信息管理系统;本文介绍了施工企业档案业务流程、系统的功能设计与实现、关键技术等;应用结果表明:该系统实现了施工企业档案资料系统化、标准化和科学化管理，提升了档案管理水平和服务效率与质量。
Subjects: Civil Engineering and Building Construction >> Civil Construction Structures submitted time 2017-11-30 Cooperative journals: 《土木建筑工程信息技术》
Abstract：为了改变施工企业内部档案传统纸质存储、手工操作的档案服务模式，开发了一种基于web的档案信息管理系统;本文介绍了施工企业档案业务流程、系统的功能设计与实现、关键技术等;应用结果表明:该系统实现了施工企业档案资料系统化、标准化和科学化管理，提升了档案管理水平和服务效率与质量。
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