EROSION AND SEDIMENTATION PROBLEMS IN SOME ASIAN COUNTRIES     

Bingnan LIN  Deyi WU  Zhide ZHOU 《国际泥沙研究》2000,(4)

1 INTRODUCTIONFrom 1989 to 1993, as project managers of the UNDP/UNESCO project entitled Regional TrainingProgramme on Erosion and Sedimentation for Asia, the writers had the privilege of meeting manyoutstanding hydraulic engineers of this region and came to learn of some important erosion andsedimentation problems thereof. Some issues as noted by the writers are presented in the followingalong the some comments. These issues are mainly concerned with rivers. It should be stated tha…  相似文献   

ANALYSIS ON PECULIARITIES OF "92.8"FLOOD EVENT IN THE LOWER YELLOW RIVER     

WANG Gang  XU Mingquan 《国际泥沙研究》1999,(2)

lCOMPOSITIONOFTHE"92.8"FLOODThreerainstormsoccurredfrom7ththrough13,,,August,1992inShaanxiProvince,diStributingfromnorthtosouthinsequence.Therainfallareacoveredtheregionsofintensivesoilerosion,'wheretheaveragerateoferosionis10,000-15',000ton/kmZ'year.Fig.IshowsisohyetsofrainfallintensityinthecatchmentoftheMiddleYellowRiVerdepictingthedistributionoftherainstormsfrom7thto13,,,August,1992(thehydrologicalBureauYRCC,1992).ThecenterofthefirstrainstormwaslocatedattheYikezhaomengPrefec…  相似文献   

油藏产量预测的不确定性     

Lia  O 王桥 《海洋地质译丛》1998,(2):10-24

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Cross-borehole flowmeter tests for transient heads in heterogeneous aquifers   总被引：2，自引：0，他引：2  

Le Borgne T  Paillet F  Bour O  Caudal JP 《Ground water》2006,44(3):444-452

Cross-borehole flowmeter tests have been proposed as an efficient method to investigate preferential flowpaths in heterogeneous aquifers, which is a major task in the characterization of fractured aquifers. Cross-borehole flowmeter tests are based on the idea that changing the pumping conditions in a given aquifer will modify the hydraulic head distribution in large-scale flowpaths, producing measurable changes in the vertical flow profiles in observation boreholes. However, inversion of flow measurements to derive flowpath geometry and connectivity and to characterize their hydraulic properties is still a subject of research. In this study, we propose a framework for cross-borehole flowmeter test interpretation that is based on a two-scale conceptual model: discrete fractures at the borehole scale and zones of interconnected fractures at the aquifer scale. We propose that the two problems may be solved independently. The first inverse problem consists of estimating the hydraulic head variations that drive the transient borehole flow observed in the cross-borehole flowmeter experiments. The second inverse problem is related to estimating the geometry and hydraulic properties of large-scale flowpaths in the region between pumping and observation wells that are compatible with the head variations deduced from the first problem. To solve the borehole-scale problem, we treat the transient flow data as a series of quasi-steady flow conditions and solve for the hydraulic head changes in individual fractures required to produce these data. The consistency of the method is verified using field experiments performed in a fractured-rock aquifer.  相似文献   

Sulfide Aggregation in Ophiolitic Dunite Channels Explains Os-Isotope Mismatch between Oceanic Crust and Mantle     

XIONG Qing  XU Yong  José M. GONZáLEZ-JINéNEZ  LIU Jingao  Olivier ALARD  ZHENG Jian-Ping  William L. GRIFFIN  Suzanne Y. O’REILLY 《《地质学报》英文版》2020,94(Z1):66-66

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西南日本和东亚大陆边缘中生代—早第三纪时与脊俯冲有关的火成活动…     

Kinos.  O 《海洋地质译丛》1996,(1):77-80,F003

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芬诺斯堪迪亚地盾的应力测量及其构造意义     

Steph.  O 《地震地质译丛》1992,14(5):33-37

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通过中非合作推动在非洲实施“气候、生态与生计”综合途径（英文）     

王国勤  付超  刘健  张林秀  Ayub M.O.Oduor  Dagne Mojo  Mulubrhan Balehegn 《资源与生态学报(英文版)》2018,(3)

非洲的可持续发展面临挑战与机遇。对于非洲大陆来说,"气候、生态与生计"(CEL)综合途径是通过整合力量实现可持续发展的一种有效方式。本文在对多个机构特别是联合国环境规划署国际生态系统管理伙伴计划(UNEP-IEMP)在非洲开展的工作进行总结的基础上,探讨了非洲在实施CEL综合途径方面的需求及机会,提出了未来在中非合作框架下如何推动实施CEL途径的看法。主要结论是,非洲是实施CEL途径的重点地区之一;UNEP-IEMP已经开展了几项重大行动,为在非洲实施CEL途径打下了基础;但应在中国和非洲现有的合作机构、网络和项目基础上建立广泛的合作伙伴关系,以支持未来关于CEL综合途径的中非合作。  相似文献   

经济全球化条件下俄罗斯矿物-原料基地     

O.P.奥尔洛夫  杜笑菊 《国土资源情报》2001,(5)

世界和俄罗斯的矿物原料基地在作为“政治-经济”范畴的全球化中的作用和地位目前尚不明确,虽然在探讨全球化问题时,每一位经济学家和政治家都无疑首先关注自然资源。 同时,全球化不是思想或科学范畴,而是当今的现实,它的发展速度很快,并在世界各个角落不仅引起了正面的,而且也引起了负面的反响。  相似文献   

SCOUR AROUND GROINS     

Masoud GHODSIAN  S. M. Hoseini TEHRANI Assistant professor of Civil Engineering  Tarbiat Modarres University  P.O. Box /  Tehran- Iran. Post graduate student  I. A. University  Research Engineer  Water Research Center  Tehran- Iran. 《国际泥沙研究》2001,16(1)

l INTRODUCTIONGroins are smictures consmicted transverse to the river flow and extended from the bank into the river.They serve one or more of the following functions: 1) training of the stream flow, 2) protection of s treambank frOm erosion, and 3) imProvement of flow dePth for navigation. Groins, according to method andtyPe of construction material, are usually classified as permeable or imPermeable. However in this paPeranother wne is introduced, i.e. semipermeable groin, which is th…  相似文献