Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-06-28 Cooperative journals: 《干旱区地理》
Abstract：利用19572019年山西省27个气象站点逐日降水数据，使用小波分析等方法对山西省暴雨时空分布特征进行分析，并基于自然灾害理论使用决策分析法（AHP）进行暴雨灾害风险评估。结果表明：（1）从时间尺度上看，山西省暴雨发生时间呈现周期性和季节性；暴雨年际变化存在4 a、9 a、14~15 a和27~28 a 4个时间尺度震荡，且震荡周期在缩短，暴雨发生的频次呈增加趋势；暴雨季节分配不均匀，多集中在夏季且形成暴雨灾害的几率较大，每年68月期间累积暴雨日数占全年比重高达85.23%，其中7月占比最大，达到45.18%。（2）从空间尺度上看，暴雨多发生在山西省中南部和海拔较高的山区，整体呈现出由东南向西北递减的规律，地区差异明显；以恒山为界，以南区域强降水发生的概率以及暴雨量普遍要高于北部区域，其中垣曲、五台山、阳城年平均暴雨量在65 mm以上，累积暴雨日数超过60 d。（3）通过对山西省暴雨灾害风险进行评估，发现山西省暴雨灾害综合风险等级空间上呈现出由南向北逐渐递减的趋势，运城盆地东北部属于高风险区，而山西省东北、西北地区则属于低风险区，其余大部分地区属于中风险区和次高风险区。
Subjects: Geosciences >> Geography submitted time 2023-05-17 Cooperative journals: 《干旱区地理》
Abstract： Settlements are the concentrated expression of man-land relationship in rural area. Exploration of the development potential and development path of rural settlements is essential to the sustainable development of rural economy. Based on the theory of rural regional system and modern rural development characteristics, this study evaluated the development potential of rural settlements, formulated zoning schemes, and analyzed the strengths and weaknesses of these schemes to explore the path of rural revitalization by taking Fenhe River Basin, Shanxi Province, China as an example. The research results show that: (1) The evaluation system was constructed by considering 11107 rural settlement patches as study objects to reveal the development potential of rural settlement from the aspects of natural environment, resources endowment, ecological protection, socio-economic level, and city driving. (2) The development potential showed a great difference, and its distribution was unbalanced in the Fenhe River Basin. The development potential of the middle and lower reaches were higher than that of the upper reaches, and the development potential of the middle valley basin was higher than that of the mountains and hills of the east and west. (3) The rural settlements were categorized into 5 first-class zones and 12 second-class zones that exhibited obvious characteristics and differences in development potential, development advantage, and development path. The results of this study contributed to the promotion and implementation of the rural revitalization strategy in the Fenhe River Basin and other similar areas.
Subjects: Geosciences >> Geography submitted time 2021-06-13 Cooperative journals: 《干旱区研究》
Abstract：土林是在干旱-半干旱地区典型的流水侵蚀地貌，研究其物质组成可揭示土林沉积环境演变过程，为进一步探究土林的发育演化奠定基础。本文采用粒度分析方法，对其地层剖面沉积物组成特征进行了研究。结果表明：（1）大同土林沉积物的粒度组成以粉沙为主，平均含量高达50.6%，其次为黏土，平均含量为36.01%，粗颗粒组分的含量较低。（2）自然频率分布曲线呈单峰和双峰分布模式，相应的累积频率曲线也呈单一直线型和两段型分布模式，表明土林沉积物组成以悬移组分占主导。（3）随着土层深度的增加，土林沉积物平均粒径呈波动变粗的趋势，分选性由较差向差波动变化，偏度由负偏经近对称向正偏转变，峰态多为宽和中等。大同土林沉积物主要形成于河流相和湖泊相沉积的环境，并夹有风成地层，且这些地层在垂直剖面上呈互层分布。土林的形成受内、外营力的共同影响，其发育演化过程与当地气候变化密切相关。
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