Excursion to Battle and Hastings: Easter Monday and Tuesday,April 10th and 11th     

W. Topley 《Proceedings of the Geologists' Association. Geologists' Association》1882,7(6):356-359

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Numerical modelling of the morphological response induced by low-crested structures in Lido di Dante,Italy     

Barbara Zanuttigh 《Coastal Engineering》2007

This paper analyses the morphological response induced by low-crested structures on the adjacent seabed, with particular interest in the erosion patterns that frequently develop at gaps and roundheads. The mechanisms responsible for erosion processes are examined by means of morphodynamic simulations with the numerical suite MIKE 21 CAMS developed by DHI Water & Environment. The main purpose of the paper is to verify how and how far a commercial code can predict bed evolution, in vicinity of defence structures in a real case, in order to get information that may be very useful for structure design and possible maintenance of existing works. The code is applied to a long-term simulation on a study site that is characterized by a composite intervention and suffers from severe erosion, Lido di Dante (Italy). The simulation covers the period (one year and a half) between two available multi-beam surveys, in order to have a detailed real bathymetry as starting point and another one, as accurate as the first, to compare numerical with surveyed results. All the other input data for the model, as waves, tide, wind and sediment characteristics, are derived from measurements in the area; moreover, the code is calibrated using wave and current data acquired during a field campaign. The bed evolution derived from simulations shows a good agreement with the survey both in the locations and in the intensity of erosive and depositional areas. A sensitivity analysis of results to some selected modelling parameters is performed on a shorter simulation period (one month), showing that accounting for bed slope in sediment transport modelling has greater effects in bathymetry evolution than the use of a complex sediment bathymetry or the representation of wave diffraction.  相似文献   

黄海海洋环境调查及其主要结果     

孙湘平  汤毓祥 《海洋科学进展》1993,(3)

本文系将我国几十年来在黄海、渤海和东海北部,开展海洋环境调查的情况与主要结果,作一简要回顾。  相似文献   

Two decades of measuring environmental attitudes: A comparative analysis of 33 countries     

Axel Franzen  Dominikus Vogl 《Global Environmental Change》2013,23(5):1001-1008

This paper analyzes the development of environmental concern by using the three waves of the environmental modules of the International Social Survey Programme. First, we discuss the measurement of environmental concern and construct a ranking of countries according to the new 2010 results. Second, we analyze the determinants of environmental concern by employing multilevel models that take individual as well as context effects into account. Third, we explore the longitudinal aspect of the data at the macro level in order to uncover the causal relation between countries’ wealth and environmental concern. The results show that environmental concern is closely correlated with the wealth of the nations. However, environmental concern decreased in almost all nations slightly during the last two decades. The decline was lower in countries with improving economic conditions suggesting that economic growth helps to maintain higher levels of environmental concern.  相似文献   

Who remembers a hot summer or a cold winter? The asymmetric effect of beliefs about global warming on perceptions of local climate conditions in the U.S.     

Peter D. Howe  Anthony Leiserowitz 《Global Environmental Change》2013,23(6):1488-1500

This paper explores the phenomenon of local climate perception and the extent to which public perceptions match climate conditions as recorded in instrumental climate data. We further examine whether perceptions of changes in local climates are influenced by prior beliefs about global warming, through the process of motivated reasoning. Using national survey data collected in the United States in 2011, we find that subjective experiences of seasonal average temperature and precipitation during the previous winter and summer were related to recorded conditions during each season. Beliefs about global warming also had significant effects on subjective experiences with above-normal temperatures, particularly among those who believed that global warming is not happening. When asked about the summer of 2010, those who believed that global warming is not happening were significantly less likely to report that they had experienced a warmer-than-normal summer, even when controlling for demographics and local climate conditions. These results suggest that the subjective experience of local climate change is dependent not only on external climate conditions, but also on individual beliefs, with perceptions apparently biased by prior beliefs about global warming.  相似文献   

20世纪50年代初地质机构变革的考证和思考     

耿元生 《地质论评》2022,68(5):2022092004-2022092004

原中央地质调查所、中央研究院地质研究所和资源委员会矿产测勘处都曾为中国地质事业的发展作出过重要贡献。但是,在1949年以前总体地质人员少、部门分散。为解决解放初期矿产资源紧缺和地质人员短缺的矛盾,1950年8月经政务院批准成立了中国地质工作计划指导委员会,及其领导下的矿产地质勘探局、中国科学院地质研究所和古生物研究所,开始了地质界一元化的机构改革。1951年5月7日新成立的三个机构开始运行,在运行初期实行地质研究人员的双重身份制度,即在矿产地质勘探局为技正,在研究所为研究员。1952年6月初步确定了各单位内设机构和人员,同时各专业地质队陆续成立,开始了人员的再次分配。1952年8月地质部成立,矿产地质勘探局,逐步转变为地质部的不同部门,地质研究所和古生物研究所全面接受地质部的领导。原中央地质调查所在这次变革中人员被分散到新成立的三个部门和有关单位,原来的内设机构被彻底分解,事实上被撤销。原中央地质调查所在长期实践中形成了以调查为本、调查与研究紧密相结合的研究风格和特色,在解放初期,不论是矿产地质勘探局还是中科院地质研究所和古生物研究所都围绕国家急需的矿产资源开展工作,都谈不上与中央地质调查所的机构传承关系。  相似文献   

农商部地质调查局始末考     

杨丽娟 《地质论评》2021,67(4):67041192-67041197

中国地质调查事业始于民国。1913年地质调查所正式成立,直至1950年裁撤,30余年间一直是中国地质学家的大本营。1916年初,地质调查所重新改组为地质调查局,并在行政上直接隶属农商部。同年夏天,地质研究所学生毕业后入地质调查局工作,成为地质调查局主要成员。1916年底,地质调查局被裁撤,又恢复地质调查所,但此后工作形式与机构管理均与调查局时期无太大变化。地质调查局因存在时间较短,加之史料不多,以往著述着墨不多。本文以《农商公报》、《政府公报》及地质调查局相关原始材料为基础,考察地质调查局成立始末、机构设置、人员组成及早期进行的地质调查工作。认为地质调查局的成立是中国地质学者建立独立地质调查专门机构的一次尝试。  相似文献   

The Algol-type close binary system SZ Her revised     

《New Astronomy》2015

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The Valley of Chin lee     

《The Journal of geography》2012,111(1):22-23

Abstract

This paper is concerned with an instructional design for the teaching of landform geography. A sequence of organizational problems is examined and suggestions made from a previous study of the southern peninsula of Michigan. Considerations of grid design, selection of terrain parameters, and the problem of regional definitions are assessed from both the historic point of view and the results of the pilot study. Of three basic landform parameters, i.e., average elevations, local relief, and average slope, the single criterion of elevation is advocated for the detection of regional homogeniety over large topographic surfaces. However, the use of local relief as a measure of surface texture is proposed for the delineation of individual terrain compartments. Suggested for all age levels above the elementary school, this project is a feasible design for an oft-neglected aspect of physical geography.  相似文献   

Matter wave explorer of gravity (MWXG)     

《Experimental Astronomy》2009,23(2):611-649

In response to ESA’s Call for proposals of 5 March 2007 of the COSMIC VISION 2015–2025 plan of the ESA science programme, we propose a M-class satellite mission to test of the Equivalence Principle in the quantum domain by investigating the extended free fall of matter waves instead of macroscopic bodies as in the case of GAUGE, MICROSCOPE or STEP. The satellite, called Matter Wave Explorer of Gravity, will carry an experiment to test gravity, namely the measurement of the equal rate of free fall with various isotopes of distinct atomic species with precision cold atom interferometry in the vicinity of the earth. This will allow for a first quantum test the Equivalence Principle with spin polarised particles and with pure fermionic and bosonic atomic ensembles. Due to the space conditions, the free fall of Rubidium and Potassium isotopes will be compared with a maximum accelerational sensitivity of 5·10^− 16 m/s² corresponding to an accuracy of the test of the Equivalence Principle of 1 part in 10¹⁶. Besides the primary scientific goal, the quantum test of the Equivalence Principle, the mission can be extended to provide additional information about the gravitational field of the earth or for testing theories of fundamental processes of decoherence which are investigated by various theory groups in the context of quantum gravity phenomenology. In this proposal we present in detail the mission objectives and the technical aspects of the proposed mission.  相似文献