Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： Mastering the regional wind sand movement environment and sediment particle size characteristics isthe key to studying wind sand flow, and is of great significance for the prevention and recovery of regional windsand disasters. Based on the wind regime data of Wuzhumuqin Sandy Land, this paper studies the variationcharacteristics of sand driving wind regime and sand transport potential, and reveals the spatial differences ofsand environment in this area by combining with the sediment particle size data. The results show that:（1）Theannual average frequency of sand blowing in the Wuzhumuqin sandy land is 33.8%, with an average wind speedof 3.34-5.40 m·s-1, and an average sand blowing wind speed of 6.46-8.49 m·s-1. The frequency and wind speedof sand blowing in the north of the sandy land are greater than those in the south, and those in the west are greaterthan those in the east.（2）The overall annual frequency and wind speed of sand storms are the highest in spring.The wind direction of sand storms is mainly in the southwest direction, and the frequency in the WSW directionis the highest. （3）The sand transport potential in the sandy land is 19.2-193.7 VU, which is generally a low windenergy environment. The wind conditions are mostly sharp bimodal wind conditions. The sand transport potentialin the north of the sandy land is greater than that in the south, and that in the west is greater than that in the east.Throughout the year, sand material is transported to the east and northeast, and spring is the most importantperiod of wind sand activity.（4）The sandy land is mainly composed of coarse and medium sand components,with soil particle sizes in the south and west being coarser and finer in the east. The sorting of sediment in thenorthern and eastern parts of the sandy land is poor, and the particle size components are greatly influenced byexternal factors. Overall, the sandstorm activity in the northern part of the sandy land is the strongest, making itsuitable for artificial planting or laying sand barriers to fix sand. Protection forest is planted in the east of thesandy land to avoid the continuous eastward movement of sand.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-11 Cooperative journals: 《干旱区研究》
Abstract：通过野外试验探究了流动沙丘中上部导风板板后作用区风速特性和输沙量特征，结果表明：不同角度导风板对板后风速增加的区域有所不同，作用区内最大风速一般出现于板后1.5 m，45°导风板对于板后1.5 m处风速加速效果明显，板后3.0 m处则是25°导风板加速效果较为明显，而在板后4.5 m处影响效果明显的导风板角度为35°。导风板可以有效的提高板后输沙总量，其中30°~45°区间的中等角度导风板对于输沙量的提升具有明显效果，45°导风板对于板后1.5 m处输沙量提升效果较高，而40°导风板对于板后3.0 m处输沙量提升效果较高，在板后4.5 m处则是30°导风板提升效果较高。
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-11 Cooperative journals: 《干旱区研究》
Abstract：基于自然灾害风险理论，选取森林雪灾相关的气象、林业、基础地理信息和社会经济等数据，从致灾因子危险性、承灾体易损性、孕灾环境敏感性和防灾减灾能力4个方面综合评估内蒙古森林雪灾风险程度的地区差异，利用加权综合评分法、层次分析法建立并计算森林雪灾综合风险评估指标体系及指数，构建出内蒙古森林雪灾风险区划模型。内蒙古森林雪灾高风险区、次高风险区分别占全部森林雪灾风险区的77.18%、0.05%，且均位于内蒙古东北部的呼伦贝尔市。中等风险区占全部森林雪灾风险区的6.01%，主要位于锡林郭勒盟、呼伦贝尔市、赤峰市及兴安盟，分别占中等风险区总面积的0.61%、36.50%、9.11%和5.99%；次低风险区和低风险区占全部森林雪灾风险区的16.76%，主要位于阿拉善盟、鄂尔多斯市、兴安盟等地。内蒙古森林雪灾风险呈现自东北向西南逐渐减轻的趋势，与森林、积雪空间分布规律基本一致。
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-09 Cooperative journals: 《干旱区研究》
Abstract：以吉兰泰荒漠绿洲过渡带为研究区，通过对不同生境条件下的白刺（Nitraria tangutorum）灌丛沙堆形态特征、各形态参数间关系及白刺灌丛生长特征进行定量分析。结果表明：① 随着梭梭（Haloxylon ammodendron）林龄的增加（白刺纯林除外），白刺灌丛沙堆各形态参数变化范围较大，并向长椭球形方向发展，部分向不对称“蝌蚪状”方向演化。② 4种不同生境条件下，白刺灌丛沙堆各形态参数相关系数均在0.782以上（P0.721 7）和幂函数、二次函数关系（R2>0.835 1）且斜率均为正，表明4种生境灌丛沙堆均处于发育阶段。④ 白刺灌丛株高和盖度对灌丛沙堆形态特征有明显影响，即白刺灌丛株高越高、盖度越大，白刺灌丛沙堆高度、底面积和体积也逐渐增大。
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