Results 41 to 50 of about 4,473 (155)
Research on risk early warning for rainfall-induced shallow landslides in Guangdong Province based on a dynamic slope instability model [PDF]
In light of the accuracy and model construction challenges in county-level meteorological risk early warning for geo-hazards, and considering the prominent characteristics that these geo-hazards mainly occur on the shallow surface of residual slopes, the
Pingxin WEI +5 more
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Digest of Middle East Studies, Volume 33, Issue 2, Page 108-124, Spring 2024.Abstract Integrating local militias in the counterinsurgency (COIN) operations in Sinai has achieved tangible successes. The presence of local fighters contributed to the penetration of the Islamic State—Sinai Province network. The integration of locals into the ongoing COIN process has imposed a degree of local participation in local governance and ...
Mohamed Saad
wiley +1 more source
Shuitu Baochi Xuebao, 2020 为研究林分密度对土壤入渗性能的影响，以晋西黄土区5种密度（1 075，1 300，1 575，1 800，2 150株/hm2）刺槐（Robinia pseudoacacia Linn.）林为研究对象，采用双环入渗法测定其土壤入渗过程，并对入渗特征指标与土壤理化性质的相关性进行分析。结果表明：（1）不同密度刺槐林土壤入渗过程的变化规律一致，均经过瞬间入渗（0~5 min）、缓慢入渗（5~40 min）和稳定入渗（40 min后）阶段。（2）土壤初始入渗速率、稳定入渗速率 ...
王珊珊 +5 more
doaj
Responses of Loess Ground with Different Slopes and Vegetation Covers to Rainfall Infiltration [PDF]
[Objective] To investigate the soil moisture response to rainfall in loess ground with different slopes and vegetation types. [Methods] Eight in-situ observation plots were established, including flat surfaces with bare soil, Artemisia cover, and Robinia
HU Xiangyang +6 more
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Shuitu Baochi Xuebao, 2018 以重庆市城镇建设和交通枢纽工程形成的典型工程堆积体为研究对象，采用野外双环入渗法对工程堆积体入渗特征、影响因素及入渗模型适宜性进行研究，筛选重庆市典型工程堆积体最优入渗模型。结果表明：（1）工程堆积体初始入渗率可达23.20 mm/min，随着入渗时间的延长，入渗速率逐渐降低，30 min瞬时入渗率为2.38~11.32 mm/min，稳定入渗率为1.81~9.05 mm/min；（2）工程堆积体的初始入渗率、稳定入渗率、平均入渗率、30 min入渗率、60 min入渗率和渗透总量均表现为中等变异 ...
李叶鑫 +4 more
doaj
Submarine fresh groundwater discharge estimation in the intertidal zone based on dynamic salinity simulation [PDF]
Currently, limited studies focused on the variations in submarine fresh groundwater discharge rates, seawater recirculation rates, and their respective proportions with tidal level change in sandy intertidal zones.
Chunlei LIU +5 more
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Shuitu Baochi Xuebao, 2022 为揭示退耕对石漠化区露石岩—土界面土壤渗透特性的影响,以典型石漠化坡耕地为对照,选择休闲地、退耕灌草和果园为研究对象,采用环刀法研究了平直、外凸和内凹型露石岩—土界面土壤渗透特性。结果表明:(1)不同退耕类型岩—土界面土壤入渗过程及特征差异较大,从初始入渗率到稳定入渗率衰减幅度在0.350~55.756 mm/min,而不同岩—土界面形状间土壤入渗速率差异较大;(2)不同退耕类型岩—土界面土壤入渗速率的主要影响因素为毛管孔隙度和非毛管孔隙度,初始入渗率、平均入渗率和稳定入渗率均与毛管孔隙度呈极显著负相关(
刘婷婷 +4 more
doaj
Analytical calculation of steady seepage in unsaturated layered soils [PDF]
The analytical calculations of unsaturated steady-state seepage in the widespread layered soils wewre relatively rare. Based on the Darcy seepage theorem and the continuity condition of soil layer interface, a mathematical model describing the steady ...
Dong QIAO, Nan WU, Peipei CHEN
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Shuitu Baochi Xuebao, 2017 双环入渗仪是田间测量土壤入渗过程和饱和导水率最常用的经典方法，但入渗仪内外环尺寸均会影响其测定结果。设计7组不同内外径的双环入渗仪，在位于祁连山区的黑河上游平坦草地开展多次野外土壤入渗试验，对比分析双环入渗仪内外环尺寸对土壤入渗率和饱和导水率的影响。结果表明，双环入渗仪内径相同时，外径越大则稳定入渗率和饱和导水率越小；外径相同时，内径越小则稳定入渗率和饱和导水率越小。初始入渗率与双环入渗仪尺寸关系不显著，但稳定入渗率和饱和导水率与入渗仪缓冲指数呈显著负相关。综合考虑安装简便，用水条件 ...
阳 +5 more
doaj
Soil Erosion Process Under the Combined Action of Water and Gravity on Red Soil Slope [PDF]
[Objective] Soil erosion is one of the most important ecological and environmental problems in the world. It is of great significance to reveal the coupling mechanism of water and gravity combined erosion by analyzing the water and sediment process of ...
MA Lan +4 more
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