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An investigation of seepage below floodwater-retarding structures conducted by the U.S.D.A. Science and Education Administration Federal Research resulted in a method for estimating seepage from a reservoir based upon change in head. A typical structure was selected for the study and physiographic and geologic features of the site were identified. Extensive hydrologic and hydrogeologic data were collected and analyzed for the site. A major inflow event was recorded in the reservoir in September 1965 and data from that event were used to develop an equation for estimating the amount of seepage lost from the structure in relation to the hydraulic head behind the structure. The method presented by the authors provides a physically based method for estimating the impact of a reservoir on the groundwater flow system assuming variable reservoir head conditions. 相似文献
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中国地震学会地震流体专业委员会 《国际地震动态》2005,(12):46-47
2005年8月19-20日,在内蒙古呼和浩特市召开了中国地震学会地震流体专业委员会2005年度学术年会。参加这次会议的主要领导和专家有：监测预报司监测处王飞副处长、地震流体专业委员会主任杨玉荣研究员、副主任刘耀炜研究员和王云基研究员、内蒙古地震局曹刚副局长、以及全国专业委员会委员和有关专家40余人。 相似文献
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N. Smodlaka 《Marine pollution bulletin》1974,5(6):84-86
Chlorinated hydrocarbons include DDT residues, PCB residues, as well as certain pesticides. These are large families of compounds and many substances which are as yet unidentified may be included in the analyses and introduce important errors. 相似文献
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Gogorza C.S.G. Di Tommaso I. Sinito A.M. Jackson B. Nuñez H. Creer K. Vilas J.F. 《Studia Geophysica et Geodaetica》1998,42(1):12-29
The preliminary results of paleomagnetic and radiocarbon dating of late pleistocene-holocene sediments from two lakes of south-western Argentina (41°S, 71.5°W) are presented. The magnetic susceptibility, intensity and direction of the natural remanent magnetisation were measured. The stability of the natural remanent magnetisation was investigated by alternating field demagnetisation. The magnetic parameters allowed the cores within each lake to be correlated.
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C analysis, total organic content measurements and C
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dating were carried out. A model of sedimentation is suggested. Using this model and the correlation, curves of variations of magnetic inclination and declination in time are shown. 相似文献