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太行山低山区泉水涌流规律试验研究 总被引：1，自引：0，他引：1
通过系统监测，对冀南太行山区泉水流量的日变化和季节变化进行了试验研究，建立了泉水流量典型日变化模型，研究发现，泉水流量与土壤热通量密切负相关，均为以24小时为周期的正弦曲线，二最大相关系数达到0.93，土壤热通量在相位上提前3个小时左右。泉水流量的季节性增加主要由降水补给。 相似文献
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THE INTERLINKAGE OF LARGE-SCALE SYSTEMS BETWEEN HIGH AND LOW LATITUDES RELATED TO PROPAGATION OF THE PLANETARY WAVE AROUND EAST ASIA IN SUMMER 总被引：1，自引：0，他引：1
This study has reviewed recent studies about impact of the Rossby wave propagation on theweather of East Asia.Then,we have focused on the northward progression of the subtropical highaffected by the propagations and their interaction.The following results are obtained:(1)The twokinds of meridional Rossby wave propagations often affect the East Asian weather in summer,which propagate in two conflicting directions(northwest-southeastward and southwest-northeast-ward).This is considered as the interaction of the large-scale systems between high and lowlatitudes with wave propagation,especially to the circulation systems around East Asia.(2)Thenorthward progression of the subtropical high is largely restrained,aecompanied by the southwardshift of the convective activity in middle latitudes,under the strong and persistent Rossby wavepropagation from high to low latitudes.And the opposite role could be found in the Rossby wavepropagation from low to high latitudes. 相似文献
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This article examined the meteorological features of the second Meiyu/Baiu episode(hereafterMeiyu Ⅱ)in 1998 and the results are summarized as follows:(1)The Meiyu Ⅱ period in 1998 hasbeen the longest and the most delayed ending one since 1885,which caused the great flood aroundthe Yangtze River Basin.The circulation situation in Meiyu Ⅱ is so typical that the averagegeopotential height and wind fields at 500 hPa and 850 hPa are very similar to monthly mean inJune.The abnormal circulation in Meiyu Ⅱ is associated with an adjusting of the Okhotsk high andshort period south-north oscillation of the subtropical high.(2)The heavy rainfall around theYangtze River during Meiyu Ⅱ period is closely related to a persistent shear line,a clear eastwardmoving vortex structure and a very strong jet flow at lower levels.It is very clear that the strongdivergence at higher levels and convergence at lower levels occurred in situ during Meiyu Ⅱ period.(3)It is very clear that the convective activity propagates eastward quickly with a period about 7days during Meiyu Ⅱ period. 相似文献
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A Comprehensive Investigation of an Offshore Active Fault in the Western Sagami Bay, Central Japan 总被引：1，自引：0，他引：1
Offshore active faults, especially those in the deep sea, are very difficult to study because of the water and sedimentary cover. To characterize the nature and geometry of offshore active faults, a combination of methods must be employed. Generally, seismic profiling is used to map these faults, but often only fault-related folds rather than fracture planes are imaged. Multi-beam swath bathymetry provides information on the structure and growth history of a fault because movements of an active fault are reflected in the bottom morphology. Submersible and deep-tow surveys allow direct observations of deformations on the seafloor (including fracture zones and microstructures). In the deep sea, linearly aligned cold seep communities provide indirect evidence for active faults and the spatial migration of their activities.The Western Sagami Bay fault (WSBF) in the western Sagami Bay off central Japan is an active fault that has been studied in detail using the above methods. The bottom morphology, fracture 相似文献
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Based on the natural and social conditions as well as hydrogeological characteristics of the Ryukyu limestone, a major aquifer in the Ryukyu Islands, a conception of underground dam, was proposed in the early 1970s in order to develop ground water resources in the Quaternary Ryukyu limestone regions of Japan. The practice of nearly thirty years has shown that the underground dam is an environment-friendly and effective way for developing ground water in these regions.To further improve the technology associated with underground dam, the authors introduced related analytic methods. The application of the geographical information system technology to site selection of the underground dam is reported in this paper. 相似文献
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焉耆盆地是一个位于天山东南部的山间盆地 ,在遥感图像上 ,可以看到盆地西面的活动构造在地表留下的痕迹 :清楚的线形构造 ,被错开的水系、冲沟等。经分析认为 ,这些活动构造主要由北边的活动褶皱和南边的右行走滑活动断裂组成。野外的实际调查与图像分析的结果十分吻合 ,表明遥感图像在研究活动构造方面是一个十分有力和快速的工具。活动断层的最大水平位移为 2 10m ,最大垂直位移为 2 0m ,主要以走滑作用为主。天山地区活动构造的发育表明印度板块向欧亚板块的碰撞仍在持续 相似文献
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DISTRIBUTION OF AEROSOL EXTINCTION IN THE LOWER TROPOSPHERE BY MICRO-PULSE LIDAR OBSERVATION 
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下载免费PDF全文 The profiles of aerosol extinction coefficients are investigated by micro-pulse lidar(MPL)combined with the meteorological data in the lower troposphere at Meteorological ResearchInstitute(MRI).Japan.Larger extinction values of aerosol are demonstrated in the nocturnalstable air layer with larger Richardson number,and light wind velocities are favorable for aerosolconcentrating in the planetary boundary layer(PBL).But aerosol extinction coefficients showlarger values over the altitudes of 2.0 to 5.0km where correspond to higher relative humidity(RH).The tops of PBL identified by the aerosol extinction profiles almost agree with ones byradiosonde data.The diurnal variations of aerosol extinction profiles are clearly displayed,intensive aerosol layers usually are formed over the period of mid-morning to 1400 Loeal Time(LT).then elapse in the cloudless late afternoon and nighttime.Thermal eonvection or turbulenttransport from the surfaee probably dominates these temporal and spatial changes of aerosoldistribution. 相似文献
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XU Jiren ZHAO Zhixin Institute of Geology Chinese Academy of Geological Science Beijing China Kono Yoshiteru Faculty of Science Kanazawa University Kanazawa - Japan 《Continental Dynamics》2000,(1)
1. IntroductionThe Nankai Trough region (Fig. 1.1) of southwest Japan is one of the most tectonically complex subduction zones in the world. The subduction of the Philippine Sea plate (PH) beneath the Eurasian plate (EU) has caused a series of large and great interplate earthquakes. It is generally accepted that great earthquakes have occurred at intervals of 100-150 years along the Nankai subduction zone since the 684 Hakuho earthquake (Fig. 1.2). However, a large earthquake (M>7.5) has… 相似文献
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