Results 51 to 60 of about 1,337 (152)
Shuitu Baochi Xuebao, 2022 针对区域流域尺度上土壤水分在地形、植被等要素协同作用下的空间异质性规律以及响应机制研究较少，以青海大通典型人工林小流域为研究对象，自坡脚向上延3个坡向（阴坡、半阴坡、阳坡）呈放射状选取3条样线带布设样点，采用统计学分析、主成分分析和冗余分析等方法研究生长季初末时期0—20，20—40，40—60，60—80，80—100 cm各层土壤水分空间变异特征，以及各环境因子（海拔、植被高度、植被冠幅、地上生物量、草本丰富度、草本盖度、枯落物干重）对其影响规律。结果表明：生长季末水分均值、最值均大于生长季初 ...
谢正丰 +7 more
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Shuitu Baochi Xuebao, 2008 以GIS为平台,结合第2次遥感调查黄土高原土壤侵蚀数据库,对大理河流域土壤侵蚀空间分布的地貌特征进行了研究。结果表明:水力侵蚀是大理河流域土壤侵蚀的主要形式。各种强度水力侵蚀空间分布的高程特征呈现峰值现象,其中强度以上水力侵蚀面积集中分布于1 240 m高程左右。各种强度水力侵蚀的面积比重,随着坡度的增加呈现先增大后减小的趋势,25°左右存在一个侵蚀临界坡度。临界坡度值随着侵蚀强度的增强而增大。坡向特征呈现双峰现象,其中东北与西南坡向是大理河流域的优势坡向 ...
沈中原, 李占斌, 杜中, 程圣东
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基于ArcGis的三维地形可视化及其在山区小城镇规划中的应用——以福建省安溪县西坪镇为例 [PDF]
, 2012 本文对于当前的三维地形可视化技术进行了研究。首先,比较了现有的各种三维地形可视化技术的优劣,然后,使用ArcGis作为平台详细展示了TIN表面建模以及进行三维分析的特点,并使用了福建省的西坪镇作为例子展示整个工作流程和分析方法。最后,总结城市规划通过地理信息系统的技术与前沿三维可视化技术的应用支撑 ...
郑宸
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Hazard assessment of landslides in Lancang County, Yunnan Province based on weighted information value model [PDF]
Lancang County is located in the longitudinal tectonic zone of western Yunnan, where landslides are frequently developed by strong tectonic movement and increasing human activities, thus posing a significant threat to the safety and security of the local
Lanting WANG +3 more
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Dizhen xuebao基于汶川MS8.0地震后在窦圌山坡顶和坡脚测点获得的9次余震记录，通过基线校正、滤波处理，得到各余震记录的傅里叶谱谱比及质点运动轨迹图，结果表明山体的自振频率具有多阶段性，其最大位移方位会出现在山体的横向或走向上，且山体存在偏振效应。将9次余震东西向和南北的水平向加速度时程以10°为单位进行分解得到324条新的时程曲线，基于分解合成后的时程记录，将坡顶与坡脚相同分解角度下的时程作比值，对其峰值加速度比和傅里叶谱谱比进行分析，结果表明二者最大值所在的方位均与山体最大位移所在的方位相同 ...
Wei Wang +5 more
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, 2010 GIS技术正深刻影响规划设计的发展,尤其是实施操作层面的方法拓展和完善。本文通过对GIS技术应用方法的介绍,结合福建省厦门莲花山佛心寺扩建规划这一案例,建立区域规划的数字高程模型,从而使规划分析建立在全面直观的空间分析模型之上,增进了对于该地块总体规划决策的理解 ...
吴一凡
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Distribution Characteristics and Coupling Relationship Between Soil Erosion and Hydrologic and Sediment Connectivity in Changchong River Basin [PDF]
[Objective] To clarify the distribution characteristics and coupling relationship between soil erosion and hydrologic and sediment connectivity in Changchong River Basin, and to provide basis for soil erosion control and soil erosion prevention in this ...
LI Jianing +4 more
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Shuitu Baochi Xuebao目的探究干旱河谷区土壤有机碳组分及其稳定性变化特征，明确环境因子与土壤有机碳组分及其稳定性之间的关系，为生态脆弱区固碳减排的系统管理提供依据。方法选择西藏波密干旱河谷区不同坡向（阴坡、阳坡、半阴坡、半阳坡）、坡位（坡下、坡中、坡上） 0~30 cm土壤为研究对象，测定土壤理化性质、土壤有机碳及其组分。结果1）阴坡土壤有机碳质量分数为11.37~34.74 g/kg，相较于半阴坡、半阳坡、阳坡分别提高55%、138%、292%。土壤颗粒有机碳、易氧化有机碳、矿质结合态有机碳 ...
褚保森 +6 more
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The Spatio-temporal Evolution of NDVI in the Three Gorges Reservoir Area Driven by the Synergistic Effect of two Factors over the Past 21 Years [PDF]
[Objective] To clarify the spatio-temporal characteristics of vegetation evolution in the Three Gorges Reservoir Area, and to quantitatively analyze the relationships between vegetation and key determinants, including climate, terrain, and human ...
LI Cheng +5 more
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A new quantitative assessment model for the joint roughness of rock masses [PDF]
ObjectiveThe joint roughness of rock masses significantly affects their mechanical properties such as shear strength and permeability. Therefore, its quantitative characterization is significant for the engineering practices of jointed rock masses ...
Hongwei LIU +5 more
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