SEDIMENTATION STUDY ON PUMPED-STORAGE POWER STATION OF PUSHI RIVER     

WANG Tiefeng Northeast Investigation  Design  Research Institute  China ZHANG Zhi Northeast Investigation  Design  Research Institute  China YI Yue Northeast Investigation. Design  Research Institute  China 《国际泥沙研究》1997,(3)

I.INTRODUCTIONThePtlmped-storagepoll,erprojectofPushiriverisconsistedofupperreservoir,lobal-erreset'oir.watertransmissionSystemandpotvergeneratingsystem.ThelowerreservoirIviththecatchmentbasinareaof1141kmZisthewatersupplierl-c'hichislocatedonthedownstreamofthePushiriverinthesouthernpactofNortheastChina.Theupperreservoirisabout300-400metershigherthanthelowerresen!oirattheleftsideoftheriverwithcatchmentbasinareaof1.12km2.Thecharacteristicsoftheprojectandreservoirareshottviintablel-l.Ino…  相似文献   

MODELING STUDY ON SEDIMENTATION CONFIGURATION IN FRONT OF THE DAM AND IN THE PRESSURE CONDUIT OF BOTTOM OUTLETS BY FLUME EXPERIMENT     

XU Guobin Senior Research Engineer  Tianjin Institute of Hydroelectric Investigation  Design  Research  Ministry of Water Resources. Dongting Road  Hexi District  Tianjin  P R. China. BAI Shilu Senior Research Engineer  Tianjin Institute o 《国际泥沙研究》1997,(3)

I.INTRODUCTIONReseri,oirsonoverloadedriverswillreachthestateofrelativeequilibriumwithcontinuousdevelopmentofsedimentation.Insuchcase,thereisdePOsitinfrontofthedam.Thereforethesiltpressureonthedambodyisconsiderablylarge.Sedimentationelevationinfrontofthedamisoneofthefactorsofcalculatingthesiltpressure.Inaddition,tokeeplong-termworkingstorageinreservoif,itisnecessarytoinstallbottomoutlets.Asthereisapressureconduitinfrontoftheoperatinggateofthebottomoutlet,thesedimelltenteredtheconduitwill…  相似文献   

STUDY ON MIXED MODEL OF NEURAL NETWORK FOR FARMLAND FLOOD/DROUGHT PREDICTION   总被引：18，自引：0，他引：18  

金龙  罗莹  郭光  林振山 《Acta Meteorologica Sinica》1997,(3)

The paper concerns a flood/drought prediction model involving the continuation of time seriesof a predictand and the physical factors influencing the change of predictand.Attempt is made toconstruct the model by the neural network scheme for the nonlinear mapping relation based onmulti-input and single output.The model is found of steadily higher predictive accuracy by testingthe output from one and multiple stepwise predictions against observations and comparing theresults to those from a traditional statistical model.  相似文献   

DYNAMIC VARIATIONS OF WATER QUALITY IN TAIHU LAKE AND MULTIVARIATE ANALYSIS OF ITS INFLUENTIAL FACTORS   总被引：1，自引：0，他引：1  

Cai Qiming Gao Xiyun Chen Yuwei Ma Shengwei Nanjing Institute of Geography  Limnology  CAS  Nanjing People''s Republic of ChinaMartin Dokulil Institute of Limnology  Austria 《地理学报(英文版)》1997,(3)

ＬａｋｅＴａｉｈｕｉｓａｌａｒｇｅｓｈａｌｌｏｗｌａｋｅｉｎＣｈｉｎａ,ｗｈｉｃｈｐａｌｙｓａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｗａｔｅｒ-ｑｕａｎｔｉｔｙｒｅｇｕｌａｔｉｏｎ,ｗａｔｅｒｓｕｐｐｌｙ,ｃｕｌｔｉｖａｔｉｏｎｅｔｃ.Ｗｉｔｈｒａｐｉｄｄｅｖｅｌｏｐｍｅｎｔｏｆａｇｒｉｃｕｌｔｕｒｅａｎｄｉｎｄｕｓｔｒｙｉｎｔｈｅａｒｅａ,ａｌａｒｇｅｎｕｍｂｅｒｏｆｐｏｌｌｕｔａｎｔｓｈａｖｅｂｅｅｎｄｉｓｃｈａｒｇｅｄｉｎｔｏｔｈｅｌａｋｅ,ｌｅａｄｉｎｇｔｏａｎｉｎｃｒｅａｓｅｉｎｎｕｔｒｉｅｎｔｓ…  相似文献   

Oxygen Isotope Exchange Kinetics Between Coexisting Minerals and Water in the Aral Granite Pluton of the Altay Mountains, Northern Xinjiang   总被引：2，自引：0，他引：2  

Liu Wei  Research Center of Mineral Resources Exploration  Chinese Academy of Sciences  Chinese Academy of Sciences  BeijingHe Baichu  Changsha Institute of Geotectonics  Chinese Academy of Sciences  Changsh  Hunanand Chen ZhenshengYichang Institute of Geology  Mineral Resources  Chinese Academy of GeologicalSciences  Yichang  Hubei 《《地质学报》英文版》1996,70(4)

Coexisting quartz, feldspar and biotite vary widely in their δ18O values and display a remarkable 18O/16O disequilibrium relation; especially, a quartz-feldspar reversal (△ 18OQUartz_feldspar< 0) exsists in the Aral granite pluton of the Altay Mountains, northern Xinjiang. The 18O / 16O exchange reaction definitely occurred between granite and water. Initial δ18O values of the granite and exotic fluid are evaluated by the mass balance consideration. The conventional method of discrimination between various magma derivations simply with δ18O values of either whole rock or separate minerals is misleading and unreliable. Experiments carried out by the authors show that the 18O / 16O exchange reaction is not accompanied by what geologists describe as petrological and mineralogical alteration effect. This decoupling relation implies that exchange reaction occurs at a relatively high temperature during subsolidus-postmagmatic cooling of magmas. The exchange mechanism is mainly diffusion-controlled. It is  相似文献   

南极乔治王岛中——新生代岩浆岩Sr—Nd—Pb同位素组成及源区特征   总被引：7，自引：1，他引：7  

邢光福  陶奎元 《岩石学报》1997,13(4):473-487

对乔治王岛１１个火山岩和２个侵入岩样品做了Ｓｒ－Ｎｄ－Ｐｂ同位素分析，其中（８７Ｓｒ／８６Ｓｒ）ｉ＝０．７０３２６～０．７０３９２，εＮｄ＝３．０２～６．７２，２０６Ｐｂ／２０４Ｐｂ＝１７．７７６～１８．５１５，２０７Ｐｂ／２０４Ｐｂ＝１５．．５０６～１５．５７１，２０８Ｐｂ／２０４Ｐｂ＝３７．８６８～３８．３０８。根据以上同位素组成及其相互关系并结合岩石学和微量元素特征及火山岩中熔融包裹体成分，得出以下结论：（１）研究的乔治王岛岩浆岩起源于亏损地幔（ＤＭＭ）和地幔流体交代成因的富集地幔ＥＭＩ混合形成的源区；（２）该源区具有广义Ｄｕｐａｌ异常，它正是由于ＥＭＩ组份加入即通过流体交代作用而产生的；（３）流体主要是俯冲深海沉积物脱碳酸盐作用而释放出的富ＣＯ２流体。  相似文献   

江苏煤层气资源分析     

傅学海  马筱英 《江苏地质》1997,21(2):120-123

简要地归纳了江苏省煤层气的成矿地质环境，分析了成煤区地质构造特征、煤层及围岩储层的物性特征，在此基础上，对主要地区煤层气资源进行了估算。  相似文献   

四川盆地碳酸盐岩油气勘探实践与认识   总被引：2，自引：0，他引：2  

陈季高 《海相油气地质》1997,2(2):22-30

四川盆地烃源十分丰富。但油气演化程度高,大多已进入高成熟和过成熟阶段,至今只在侏罗系发现有油藏,三叠系及其更老地层皆为气藏。储层主要为碳酸盐岩,其特点是低孔低渗,平均孔隙度仅1.7%,平均渗透率小于1×10~(-3)μm~2,但其中的“孔洞发育层段”平均孔隙度可达3%～6%。根据四十年的勘探经验,加强预探并争取新发现是四川盆地油气勘探发展的关键。预探中,按构造带规划大中型气田勘探目标,将成藏条件相似、地域上相邻的局部圈闭群作为一个整体勘探对象,实行稀井广探,少井高效。“八五”以来,在高陡构造带勘探技术、储层横向预探技术等方面有长足的进步,勘探成效不断提高,实现了资源序列的良性循环。  相似文献   

混合二维泊松过程的分解算法及其在提取地震丛集模式中的应用.          下载免费PDF全文

裴韬  周成虎  杨明  骆剑承  李全林 《地震学报》2004,26(1):53-61

将一定范围内的地震数据假设为背景地震和丛集地震的叠加，并同时认为背景地震和丛集地震分别满足不同参数的二维泊松过程．通过引入N阶距离概念，将叠加的二维泊松过程转化为一维的混合密度函数，在对距离阶数进行选择的基础上，最终采用遗传算法进行混合密度分解，以达到提取地震丛集模式的效果．文中将该算法应用于我国西南地区松潘及龙陵主震前丛集地震的提取，并与C值的时间扫描结合，深化了这两次大地震前地震活动图象的认识．   相似文献   

江苏及南黄海地区历史地震类型分布特征          下载免费PDF全文

田建明  徐徐  谢华章  杨云  丁政 《地震学报》2004,26(4):432-439

通过对江苏地区及南黄海海域历史地震资料特点分析，将研究区历史地震类型分为相对安全类和相对危险类，并对地震类型的统计结果、地理分布特征及构造进行探讨. 结果表明:① 江苏及南黄海地区绝大多数中强以上历史地震类型为相对安全类，仅有13.8%的中强以上历史地震为相对危险类；② 江苏陆地、长江口以东海域和南黄海北部坳陷地区以相对安全类地震为主，苏中沿海南黄海海域地震类型分布较为复杂，相对安全类和相对危险类地震类型比例基本相当；③ 研究区历史地震类型统计结果和空间分布特征与现代地震序列类型实况非常吻合，反映本区地震活动具有继承性的特点.研究结果可以作为江苏省地震应急工作中震后早期趋势判定的参考依据.   相似文献