黄土高原典型流域网格化逐时降水融合产品CMPA V1.0的精度分析

选取黄土高原无定河、窟野河和皇甫川流域为研究区,从水文应用角度评估了中国自动站与CMORPH融合的逐时降水产品(CMPA V1.0)的精度。结果表明,CMPA V1.0降雨数据总体上较雨量站实测值偏低;与6、9月相比,8月降水产品精度较低。随降水量级的增加,CMPA V1.0对降水事件发生频次的监测能力和对降水事件监测的稳定性有所降低,误报率整体升高;CMPA V1.0低估了小雨的发生频率及降水贡献率,高估了雨强大于2.5mm/h降雨的发生频率及降水贡献率;CMPA V1.0能合理地反映研究区降水的日变化过程,但低估了研究区的时段平均降水量和时段平均降水频率,高估了研究区14:00前的时段平均降水强度。     

Characterization and mineral beneficiation of Egyptian glauconite for possible industrial use

A thorough characterization of a glauconite sample collected from a core drilled on the southeast edge of the Abu Tartur Plateau in the Western Desert of Egypt was carried out. The sample, which represents the upper part of the Campanian Duwi Formation, was examined using a petrographic polarizing microscope as well as X-ray diffraction and X-ray fluorescence methods. The magnetic behavior of the different size fractions was tested using a Frantz isodynamic separator prior to the beneficiation process. This process was conducted by both magnetic separation, using an Eriez rare earth roll magnetic separator, and heavy liquid gravity methods during the search for a higher grade of K₂O. A correlation between the mineral composition and magnetic behavior of the particles was shown. Two potassium oxide concentrates were obtained, having 6.8 and 6.22% K₂O, from an original sample containing 4.41% K₂O by weight. A blend of both products yielded a product having 6.42% K₂O with an overall recovery of 41.5%, which may satisfy the requirement of a natural fertilizer. The association of this product with phosphate and pyrite will help to remediate alkaline soils. In addition, a sulfur-rich coproduct containing 11.32% S with a recovery of 31.6% was obtained.     

Oscillation propagation features of the atmosphere around the Qinghai-Xizang Plateau during the spring season of typical strong and weak monsoon years

The interaction between the low-frequency atmospheric oscillation(Madden-Julian Oscillation,MJO) and the diabatic heating over the Qinghai-Xizang Plateau(QXP) from March to June is analyzed.The results show that there are respectively two and one wave trains around the QXP during the onset of the South China Sea monsoon in strong and weak monsoon years.The locations and strength of the wave train propagation differ between the strong and weak monsoon years.Because diabatic heating of the QXP prevents the lo...     

黄土高原天然气管道施工组织与管理初探

天然气能源在我国的市场前景非常广阔,目前西部天然气大部分通过输气管道途经黄土高原输送到东部沿海.黄土高原有其特有的地形和气候特点,所以管道施工有一定的特殊性.针对黄土高原特殊地形和气候条件,梳理了天然气管道施工中的主要工序,对施工组织管理、安全管理等方面的注意事项进行了阐述,并对黄土高原地区的管道施工组织与施工管理进行初步探索,为同类工程施工提供借鉴.     

强夯处理湿陷性黄土地基工程特性浅析

结合豫西某电厂湿陷性黄土地基强夯处理工程实践,分析处理前后土层的工程特性,结果表明,采用强夯处理不同性质的湿陷性黄土,产生的处理效果不同,可为类似工程提供借鉴。     

Geomagnetic polarity transitions recorded in the Miocene lavas of the Wuyu basin,Tibet

Geomagnetic polarity transitions were the most important phenomena in the study of the geomagnetic field evolution and the earth's deep interior dynamics.The Miocene postcollisional ultrapotassic-potassic rocks are widely distributed in the Lhasa Block of southern Tibet.Paleomagnetic studies on the Wuyu Formation indicated that these volcanic rocks recorded the C5Bn.2n-C5Bn.1r and C5ACr-C5ACn geomagnetic polarity transitions.The virtual geomagnetic poles(VGPs) of these two polarity transitions were located ...     

Thick Miocene eolian deposits on the Huajialing Mountains:The geomorphic evolution of the western Loess Plateau

The geomorphic evolution of northwestern China during the Cenozoic has been a subject of much geological interest because of its link with the uplift of the Himalayan-Tibetan complex.Much information about these changes is recoverable from the sedimentary sequences of the region.We report here on the thick eolian deposits mantling the Huajialing Mountains,a relatively flat mountain range in the western Loess Plateau.Correlation of magnetic susceptibility stratigraphy with the QA-I Miocene eolian sequence da...     

黄土高原半干旱区生态化“水—绿”双赢空间模式构建

黄土高原半干旱区是风景园林规 划的生态敏感地带,缺水少绿是当地人居环 境面临的主要问题。通过对水、绿、人三者 微妙关系的研究,以集水造绿、生态修复与 产业规划为切入点,将“水绿双赢”理论与 基于人居要素的景观空间规划实践相结合, 可总结出该区生态化水绿双赢的秩序原则、 类型原则、形式原则和承载原则,并根据四 类典型地形构建川塘水岸挂淤减蒸、固根护 岸、乔灌混交、农林共产的空间模式,沟壑 沟底保墒淤地、果农间作、沟坡同治、固坝 缓流的空间模式,山地坡面因产制地、散坡 控流、纯混复层、梯坡同造的生态化水绿双 赢空间模式。空间模式可指导该区的风景园 林规划,改善人居环境。     

我国青藏高原矿产地储备战略思考

做好矿产地储备工作,有利于保持我国优势矿产资源的国际优势地位、增强话语权,保障短缺大宗矿产资源的安全供应,促进矿产资源的代际合理分配和永续利用。在分析青藏高原地质工作相关情况的基础上,从维护国家经济安全、推进生态文明建设、平衡资源代际分配、增强国际市场话语权、化解产能过剩等方面论述青藏高原矿产地储备的必要性。同时,着力从矿种、区位、勘查程度和工作思路等方面展开对青藏高原矿产地储备的思考。最后针对性提出设立矿产地储备专项资金、建立矿产地储备管理体制和制定矿产地储备专项规划等对策建议。     

Modified vegetation-erosion dynamics model and its application in typical watersheds in the Loess Plateau

The vegetation-erosion model was applied in three typical watersheds of hilly and gully area in the Loess Plateau in northwestern China to study the dynamic relations between vegetation coverage and soil erosion rate and various stresses. The model was improved by introducing rainfall and runoff factors. Then the modified model was applied in the Luergou and Luoyugou watersheds. The calculation results with the modified model were compared with the results of the original model. The precisioos of simulated vegetation coverage and soil erosion rate with the modified model were greatly improved compared with the original model. Soil erosion rate reduced with increasing vegetation coverage and the human disturbance caused high soil erosion.