曾文水库保护带泰山滑坡之调查与治理   总被引：1，自引：0，他引：1  

许中立  李金来 《山地学报》2002,20(4):411-420

崩塌与滑坡灾害之治理，首重破坏诱因了了解与破坏机制之调查。再根据调查观测所得之资料与参数，着手进行设计适当之防治对策，方能得到良好的治理成效。泰山滑坡位于台湾南部极重要之曾文水库的保护带。其边坡由陆陆续续的崩陷而逐渐演变为坍滑，甚至造成交通中断受阻。调查发现本区为属浅层滑动，滑动区平面类似酒瓶状，主要原因为长期受到雨水之漫流与渗透软化的影响，加上蚀沟之切割淘刷作用，使得边坡容易失去支撑而滑动。经施以经济有效的蚀沟控制工程兴建多座潜坝，跌水与排水设施后，发现确定提高了边坡之稳定性，地区产业因而可以持续动作，是一次相当成功的治理案例模式，但由于施工便道之开 当，遂再度诱发部份边坡的坍滑，故尔后之维护管理工作极为重要。  相似文献   

Storm-influenced siliciclastic and carbonate ramp deposits, the Lower Ordovician Dumugol Formation, South Korea   总被引：4，自引：0，他引：4  

YONG IL LEE  JEONG CHAN KIM 《Sedimentology》1992,39(6):951-969

The Dumugol Formation (Lower Ordovician) in the southern part of the Baegunsan syncline, South Korea, contains mixed siliciclastic and carbonate ramp deposits. The ramp sediments were frequently influenced by storm events resulting in tempestites of sandstone-mudstone couplets, bioclastic grainstones to packstones, flat-pebble conglomerates, a skeletal lag layer and laminated calcisiltites. All tempestites are characterized by an erosive to sharp base, poor grading and a transitional upper boundary. The difference in lithology of tempestites appears to have been controlled by the nature of substrates and by proximality. For example, laminated calcisiltites have developed on the shallow carbonate ramp, flat-pebble conglomerates are closely associated with nodular limestones on shallow and deep ramps, and thin skeletal lag layers from fossiliferous argillaceous sediments formed in a basinal setting. The stratigraphic succession of the Dumugol Formation represents an initial transgression followed by a regression. The vertical facies change records the transition from a shallow siliciclastic ramp to a deep carbonate ramp, to a basin, shallowing to a deep carbonate ramp, and to a shallow carbonate ramp. Storm effects are mostly well preserved in shallow to deep ramp deposits.  相似文献   

NOTE ON THE MEITIEN LIMESTONE,AN UPPER PERMIAN FORMATION IN THE NANLING RANGE     

李毓堯 《地质学报》1934,13(1)

Meitien is one of the largest villages in Ichanghsien, Hunan, and is situated about 20 km. west-southwest of the Ichang City. The well-known Chitienling (騎田嶺), one of the "Five Ranges" of the Nanling, stands on the north side of Meitien, at a distance of  相似文献   

SIGN REVERSALS IN THE TRANSIENT METHOD OF ELECTRICAL PROSPECTING (ONE-LOOP VERSION)*     

T. LEE 《Geophysical Prospecting》1975,23(4):653-662

The transient electromagnetic fields observed by the MPPO-1 equipment in practice over geological structures cannot always be adequately explained by Maxwell's equation when the imaginary part of the conductivity of the rocks is neglected. If, for any reason, the conductivity of the rocks is a complex function of frequency such that the imaginary part is appreciable the model calculations must include this. This explains why some observed transient electromagnetic decay curves change sign with time.  相似文献   

用板块构造学说对中国部分地区构造发展的初步分析   总被引：16，自引：2，他引：16       下载免费PDF全文

李春昱 《地球物理学报》1975,18(1):52-76

为便于在大陆上研究板块构造,作者提出了几项原则,作为参考:1.板块接触带时常表现为一条大断层或断裂带,延伸至少数百公里,经常超过一千公里;2.在两个相邻的板块上,沉积岩相和古生物群有显著的划分;3.有混杂堆积的出现;4.有蛇绿岩带的出现;5.有蓝片岩的出现;6.侵入岩与喷出岩具有规律性的分布;7.地震震中的分布;8.两个相邻板块所指极向的不同移动轨迹. 根据上述原则,结合中国地质情况进行分析,作者认为我国有几条山脉和地区可能是板块构造接触带.这些是:1.秦岭东西构造带,2.台湾省东岸,3.西藏的雅鲁藏布江,4.金沙江上游,5.龙门山及“康滇地轴”,6.祁连山北部边缘. 在工作中也遇到了以下几个有待进一步研究的问题:1.大陆板块对大陆板块互相碰撞的说法,似应作一定的修改.因为几乎所有大陆上的俯冲带都是沿着地槽的一边或两边发生的,而不是两个大陆板块直接相互接触.它和大陆边缘的海洋板块对大陆板块的移动,极为相似。2.超基性岩是否能侵入到大陆地壳,还是只能生成于地幔?3.如果说超基性岩只出现于地槽,则古老地块中有超基性岩出现时,是否可以说,这是以前地槽沉积的变质岩,而不是古老的岩浆岩体,例如秦岭的大华群和大别山的淮阳地盾等。  相似文献   

Petrogenesis of Mesozoic, Peraluminous Granites in the Lamoille Canyon Area, Ruby Mountains, Nevada, USA   总被引：5，自引：0，他引：5  

LEE  SANG-YUN; BARNES  CALVIN G.; SNOKE  ARTHUR W.; HOWARD  KEITH A.; FROST  CAROL D. 《Journal of Petrology》2003,44(4):713-732

Two groups of closely associated, peraluminous, two-mica graniticgneiss were identified in the area. The older, sparsely distributedunit is equigranular (EG) with initial  相似文献   

NUTRIENT LOAD ESTIMATION METHODS FOR RIVERS   总被引：2，自引：0，他引：2  

Huai-en LI. Joseph Hun-Wei LEE  Ming CM Professor  Environmental Science Institute  Xi''''an University of Technology. Xi''''an . Shaanxi  P.R. China.Professor  Department of Civil Engineering  The University of Hong Kong  Pokfulam Road  Hong Kong.P.R. China  Ph.D. student in Hydrology  Water Resources. Environmental Science Institute  Xi''''an University ofTechnology  Xi''''an  Shaanxi  P.R. China 《国际泥沙研究》2003,18(4)

Pollutant load estimation is essential for watershed management and water pollution control. For most watersheds, only sparse water quality measurements (e.g. monthly data) are available. The influence of input data on the accuracy of non-point source pollution load estimation is studied using the water quality and stream flow data from a small watershed in Hong Kong. Comparison and analysis of the results using 8 different methods show that the accuracy of stream-flow runoff is the single most important factor for the calculation of pollutant load. Based on the results, the stream flow correction coefficient is advanced to provide a more reliable load estimation. The improved method of pollutant load estimation can be easily applied in practice since the stream-flow runoff can be measured by hydrological station or estimated with various hydrological methods.  相似文献   

Tectonometamorphic evolution of the Chuncheon amphibolite, central Gyeonggi massif, South Korea   总被引：9，自引：0，他引：9  

SEUNG RYEOL LEE  MOONSUP CHO 《Journal of Metamorphic Geology》1995,13(2):315-328

Abstract The Chuncheon amphibolite, part of the Gubongsan Group which overlies the Yongduri gneiss complex, is interlayered with calc-silicate rock, marble, quartzite, biotite schist and quartzofeldspathic gneiss in the central Gyeonggi massif, South Korea. Metamorphic pressures and temperatures estimated from the amphibolite are 5.5–10.6 kbar and 615–714°C. These P—T conditions are close to those defined by the reaction curve between kyanite and sillimanite, and suggest medium-pressure-type metamorphism of the Chuncheon amphibolite. For two metapelites intercalated with the amphibolite, temperatures are estimated to be 607–699° C, consistent with those obtained from the amphibolite. On the other hand, pressures estimated from these metapelites are significantly different, 4–6 kbar and 9–13 kbar, when rim and core compositions of garnet are, respectively, used. These P—T estimates obtained from the amphibolite and metapelite suggest a nearly isothermal decompression of 3–7 kbar during denudation. Rapid decompression is likely on the basis of the results of mineral chemistry, phase equilibria and geothermobarometer. Moreover, in conjunction with the occurrence of kyanite in the adjacent Gyeonggi gneiss complex, P—T estimates of the Chuncheon amphibolite and metapelite suggest a clockwise P—T—t path. This evolutionary path may be related to the amalgamation of continents during the late Proterozoic event which corresponds to the Jinningian orogeny in the Qinling belt of China.  相似文献   

COMMENT ON “EFFICIENT 2D AND 3D SHOT RECORD REDATUMING” N. A. KINNEGING,V. BUDEJICKY,C. P. A. WAPENAAR AND A. J. BERKHOUT1     

STEWART A. LEVIN  STAN Y. C. LEE 《Geophysical Prospecting》1990,38(5):569-573

  相似文献   

Equilibrium Compositions of Coexisting Garnet and Orthopyroxene: Experimental Determinations in the System FeO-MgO-Al2O3-SiO2, and Applications   总被引：1，自引：0，他引：1  

LEE  HAN YEANG; GANGULY  JIBAMITRA 《Journal of Petrology》1988,29(1):93-113

We have determined the Fe-Mg fractionation between coexistinggarnet and orthopyroxene at 20–45 kb, 975–1400?C,and the effect of iron on alumina solubility in orthopyroxeneat 25 kb, 1200?C, and 20 kb, 975?C in the FMAS system. The equilibriumcompositions were constrained by experiments with crystallinestarting mixtures of garnet and orthopyroxene of known initialcompositions in graphite capsules. All iron was assumed to beFe²⁺. A mixture of PbO with about 55 mol per cent PbF₂ provedvery effective as a flux. The experimental results do not suggest any significant dependenceof K_D on Fe/Mg ratio at T 1000?C. The lnK_D vs. l/T data havebeen treated in terms of both linear and non-linear thermodynamicfunctional forms, and combined with the garnet mixing modelof Ganguly & Saxena (1984) to develop geothermometric expressionsrelating temperature to K_D and Ca and Mn concentrations in garnet. The effect of Fe is similar to that of Ca and Cr³⁺ in reducingthe alumina solubility in orthopyroxene in equilibrium withgarnet relative to that in the MAS system. Thus, the directapplication of the alumina solubility data in the MAS systemto natural assemblages could lead to significant overestimationof pressure, probably by about 5 kb for the relatively commongarnetlherzolites with about 25 mol per cent Ca+Fe²⁺ in garnetand about 1 wt. per cent Al₂O₃ in orthopyroxene.  相似文献