南水北调中线工程(河南段)综合物探运用效果     

冷元宝 《河南国土资源》1998,(4)

本文介绍了南水北调中线工程（河南段）物探工作概况,简要叙述了渠段地形地质概况、地球物理特征及物探方法技术,着重分析了物探测试效果。  相似文献   

Late Quaternary palaeohydrology of the Konya Basin, Turkey, based on isotope studies of modern hydrology and lacustrine carbonates     

Melanie J. Leng  Neil Roberts  Jane M. Reed  Hilary J. Sloane 《Journal of Paleolimnology》1999,22(2):187-204

The Konya plain in south central Anatolia, Turkey, which is now largely dry, was occupied around the time of the Last Glacial Maximum by a fresh-oligosaline lake covering more than 4000 km². Sediment cores from three residual water bodies (Pinarbai, Akgöl and Süleymanhaci) within the larger Pleistocene lake basin, have been analysed using a multidisciplinary approach. The sediment sequences are dated as spanning the last 50 Ka years, although breaks in sedimentation mean that there is only partial chronological overlap between them. Carbon and oxygen isotope analyses on lacustrine carbonate from the three cores give contrasting isotope profiles which reflect the different ages and independent hydrological behaviour of different sub-basins through the late Quaternary. Distinguishing changes that are regional from local effects is aided by modern isotope hydrology studies and by comparing the carbonate ¹³C and ¹⁸O values to diatom and other analyses undertaken on the same cores.  相似文献   

辽河断陷西部凹陷油气成藏主控因素   总被引：4，自引：0，他引：4       下载免费PDF全文

冷济高  庞雄奇  李晓光  高先志  崔丽静  苏栋 《古地理学报》2008,10(5):473-480

辽河西部凹陷油气资源非常丰富,通过对己勘探发现的773个油气藏的地质特征参数统计认为,西部凹陷油气藏类型非常丰富,但主要以构造和岩性油气藏为主,且复合油气藏发育,统计表明,近90%的油气藏与断裂有关。油气藏类型受构造带控制作用明显,缓坡带最要以背斜、岩性构造油气藏为主,中央背斜带背斜断块油气藏较为发育,而陡坡带则多为岩性油气藏。沉积相带控油气作用明显,油气藏主要分布在扇三角洲、三角洲和浊积扇相。油气资源在空间上遵循“油气总量平衡模式”,无论在平面上还是层位上,油气资源互补特征性强。研究认为西部凹陷具有生烃洼陷、断裂、异常压力、沉积相带联合控藏的特点。首先沙三段、沙四段有效烃源岩大量发育,资源量极为丰富,为西部凹陷油气富集提供了物质保证,油气藏分布主要受生烃洼陷控制;各组段砂体叠合连片,平面展布连续,具较好的储集能力,也为油气的侧向运移提供的条件;另外东营末期因走滑引起的大量泄压断裂发育,为油气大规模远距离垂向运移提供了可能。  相似文献   

Stability of Pineapple Leaf Residue Chars Generated by Controlled Combustion and by Field Burning in Tropical Peat          下载免费PDF全文

Lee Yit Leng  Ahmad Husni Bin Mohd. Hanif  Samsuri Abdul Wahid 《洁净——土壤、空气、水》2014,42(5):648-656

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Integrated Water Systems Model for Terrestrial Water Cycle Simulation   总被引：2，自引：0，他引：2  

Qiuhong Tang  Xingcai Liu  Zhe Li  Xiaobo Yun  Xuejun Zhang  Qiang Yu  Jun Li  Yongyong Zhang  Huijuan Cui  Siao Sun  Chi Zhang  Yin Tang  Guoyong Leng 《地球科学进展》2019,34(2):115-123

The terrestrial water cycle is influenced by a wide range of climatic variables and human disturbances. In the era of the Anthropocene, when humans drive the changes in atmospheric and hydrological processes in river basins, there is an urgent need to include human impacts in the study of the terrestrial water cycle. This paper focused on the large-scale hydrological modeling which takes account of human impacts, reviewed the research progress of the natural and human-induced changes in the terrestrial water cycle and the development of comprehensive terrestrial hydrological models in recent years, and proposed that an integrated water system model with human-related processes such as crop water demand model, engineering regulation and social water demand, be the key to large-scale water cycle simulations under changing environment. Based on the existing large-scale land surface hydrological model, there is a need to put forward the integration of the human-related processes. A comprehensive integrated water system model that considers multi-processes can help us to understand the key mechanisms of how climate change and human activity influence the regional water cycle. It also provides a theoretical and practical basis for investigating the causes and effects of changes in terrestrial water cycle under a changing environment, and thus offers scientific support for climate change adaptation in the water sector.  相似文献   

对地强耦合拖曳式检波系统的研制     

张燕生  冷广昇  赵镨  王秀荣 《中国煤炭地质》2019,(3):72-76

因城市地下浅层空间探测要求在硬化路面上进行无损检测,而传统的采集方法是采用石膏或其它粘合剂固定检波器进行数据采集,施工效率较低,为此开发研制了一种对地强耦合拖曳式检波系统。该系统通过信号线缆和装配在耦合底盘上的检波装置形成单条或多条24道的拖曳式检波串,从而实现二、三维数据采集。通过拖拽式检波系统和粘接式检波系统在相同激发条件下数据对比,其在波形能量、频谱、功率谱、相位谱及叠加效果等方面具有较高的一致性,且拖拽式检波系统无明显的共振现象。试验证明该系统对地耦合性能良好,施工效率高,适用于城市浅层地震勘探。  相似文献   

Debris flows monitoring and localization using infrasonic signals     

Xiao-peng Leng  Dun-long Liu  Fang-qiang Wei  Yong Hong  De-fu Dai 《山地科学学报》2017,14(7):1279-1291

Infrasonic waves(frequency ≤ 20 Hz) are generated during the formation and movement of debris flows, traveling in air with a speed far higher than that of the debris-flow movement. Infrasound monitoring and localization of infrasonic waves can serve as warning properties for debris-flows. Based on the characteristics of infrasonic signals, this study presents a three-point array of infrasound sensors as time-synchronous multiple sensors for acquiring signals. In the meantime, the signals are sorted by mutual correlation of signals to figure out their latency, and by means of array coordinating to locate the sound source to realize the monitoring and positioning of a debris-flows hazard. The method has been in situ tested and has been proven to be accurate in monitoring debris-flow occurrences and determining their positions, which is particularly effective for pre-event warning of debris-flow hazards.  相似文献   

Viscous heating, adiabatic heating and energetic consistency in compressible mantle convection   总被引：1，自引：0，他引：1  

Wei Leng  Shijie Zhong 《Geophysical Journal International》2008,173(2):693-702

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Design of farmland gis for precision agriculture   总被引：1，自引：1，他引：0  

ANKai XIEGao-di LENGYung-fa XIAOYu 《中国地理科学(英文版)》2003,13(1):20-24

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A Coupled Calibration and Modelling Approach to the Understanding of Dry-Land Lake Oxygen Isotope Records     

Matthew D.?JonesEmail author  Melanie J.?Leng  C. Neil?Roberts  Murat?Türke?  Rana?Moyeed 《Journal of Paleolimnology》2005,34(3):391-411

Comparisons between climate proxies and instrumental records through the last two centuries are often used to understand better the controls on palaeoarchives and to find relationships that can be used to quantify changes in pre-instrumental climate. Here we compare an 80-year-long annually resolved oxygen isotope record from Nar Gölü, Turkey, a varved lake sequence, with instrumental records of temperature, precipitation, wind speed, relative humidity and calculated values of evaporation, all of which are known to be possible controls on lake oxygen isotope systems. Significant relationships are found between the isotope record and summer temperatures and evaporation suggesting these are dominant controls on the isotope hydrology of this non-outlet lake. Modelling the stable isotope hydrology of the lake system allows these relationships to be tested independently. We show that the isotope record follows the same trends in the temperature and evaporation records but that, even when combined, these two climatic factors cannot fully explain the magnitude of change observed in the isotope record. The models show the lake system is much less sensitive to changes in evaporation and temperature than the climate calibration suggests. Additional factors, including changes in the amount of precipitation, are required to amplify the isotope change. It is concluded that proxy-climate calibrations may incorrectly estimate the amplitude of past changes in individual climate parameters, unless validated independently.  相似文献