发布求助
文献互助 智能选刊 最新文献

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science最新文献

筛选
英文 中文
Natural hazard assessment using GIS and remote sensing methods, with particular reference to the landslides in the Wondogenet Area, Ethiopia 利用地理信息系统和遥感方法进行自然灾害评估，特别是埃塞俄比亚Wondogenet地区的滑坡
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(01)00065-4
B. Temesgen , M.U. Mohammed , T. Korme
{"title":"Natural hazard assessment using GIS and remote sensing methods, with particular reference to the landslides in the Wondogenet Area, Ethiopia","authors":"B. Temesgen ,&nbsp;M.U. Mohammed ,&nbsp;T. Korme","doi":"10.1016/S1464-1917(01)00065-4","DOIUrl":"10.1016/S1464-1917(01)00065-4","url":null,"abstract":"<div><p>Wondogenet is located at the Eastern margin of the Main Ethiopian Rift. The geology of the area consists of volcanic rocks (ignimbrites, basalts, tephra) and volcano - lacustrine sediments of Plio - Pleistocene age. Morpho - dynamic activities have developed rugged and dissected landscape. These have been coupled with frequent heavy precipitation and accelerating human impact to produce frequent landslide problems.</p><p>In this study landslide occurrences and their relationships with various event controlling parameters have been evaluated using GIS and remote sensing techniques. Statistical relationships of these parameters with landslide occurrences were converted into risk susceptibility priority numbers. These numbers were re scaled between 0 and 1 for each layer before integrating them into a cumulative risk factor on which the landslide hazard zoning was based.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 9","pages":"Pages 665-675"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00065-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83570036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 163
Image analysis for debris flow properties estimation 泥石流特性估计的图像分析
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(01)00059-9
R. Genevois , A. Galgaro , P.R. Tecca
{"title":"Image analysis for debris flow properties estimation","authors":"R. Genevois ,&nbsp;A. Galgaro ,&nbsp;P.R. Tecca","doi":"10.1016/S1464-1917(01)00059-9","DOIUrl":"10.1016/S1464-1917(01)00059-9","url":null,"abstract":"<div><p>On August 1998 some debris flows were recorded by an automated monitoring system at Acquabona creek (Eastern Italian Alps). In this paper, motion picture of the flow, timing of single coarse particles on the flow surface, geophone recordings and ultrasonic logs were used to obtain velocity, depth and particle size data for the August 17 debris flow. Analogical images, recorded from zenithal camera located along the flow channel axis, have been converted in digital format and then processed in order to obtain a suitable identification of single flowing particles. Through image analysis techniques, grain-size and surface velocity distributions of debris flows are estimated. These properties are of the outmost importance in developing a proper rheological model for debris flows. Front velocities ranged from 1.8 to 4 m/s and corresponding flow surface velocities ranged from 2.26 to 4.18 m/s. A range of slurry shear strengths and viscosities occur in different surges of the same event. These differences in rheological flow behaviour appear to be influenced by concentration of particles and by flow particle-size distributions too. Coarser slurry are related a Bingham flow and finer slurry is associated to Newtonian flow. The development of rigid plugs is an index of rheological behaviour. In the observed surge Bingham flow is characterised by plug widths between 62 and 94% of flow width for flow depth higher than 45 cm. When depth dropped below 45 cm, slurry is finer and more liquid and flow transformed to hyperconcentrated flow. Turbulent small less concentrated surges are caused by a sort of pushing effect of the following coarser debris surge.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 9","pages":"Pages 623-631"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00059-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78873906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
The E layer shape: the combination with existing models E层形状:与现有模型的结合
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(01)00006-X
J. Hafner , R. Leitinger , J. Titheridge
{"title":"The E layer shape: the combination with existing models","authors":"J. Hafner ,&nbsp;R. Leitinger ,&nbsp;J. Titheridge","doi":"10.1016/S1464-1917(01)00006-X","DOIUrl":"10.1016/S1464-1917(01)00006-X","url":null,"abstract":"<div><p>The global maps for the E layer peak density are considered to be adequately good for daytime and new formulations for nighttime have been included in existing models. However, there are doubts about the validity of the shape of the electron density profile in E region heights. J. Titheridge has developed an E region chemistry model which provides improvements of the profile shape. We have modeled this shape on the basis of polynomial expansions. The resulting E region profile can be combined with existing ionospheric models, e.g., with the International Reference Ionosphere (IRI) or with the ‘family’ of models recently developed at Graz and Trieste.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 5","pages":"Pages 319-323"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00006-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81222516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On volatile particle formation in aircraft exhaust plumes 飞机废气中挥发性微粒的形成
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(01)00047-2
A. Sorokin, X. Vancassel, P. Mirabel
{"title":"On volatile particle formation in aircraft exhaust plumes","authors":"A. Sorokin,&nbsp;X. Vancassel,&nbsp;P. Mirabel","doi":"10.1016/S1464-1917(01)00047-2","DOIUrl":"10.1016/S1464-1917(01)00047-2","url":null,"abstract":"<div><p>In this article, the effect of the size bin resolution in a discrete aerosol dynamic model which predicts the formation of particles in an aircraft plume is examined. The model includes plume dilution and both the effect of neutral and charged particles on coagulation, with coefficients which vary with particle size and charge. A comparison of the model results is made with the in-flight experimental data collected in the plume of the ATTAS aircraft during the SULFUR-5 mission (Schröder, 1998). From this comparison, it appears that the choice of the value to be used for the “volume ratio” in the coagulation scheme is crucial to correctly determine the size distribution of the particles, especially for the larger sizes, as well as the emission indices for volatile particles.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 8","pages":"Pages 557-561"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00047-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83845438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Particle acceleration and wave phenomena in the auroral region 极光区域的粒子加速和波动现象
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(00)00084-2
R.L. Lysak , M. André
{"title":"Particle acceleration and wave phenomena in the auroral region","authors":"R.L. Lysak ,&nbsp;M. André","doi":"10.1016/S1464-1917(00)00084-2","DOIUrl":"https://doi.org/10.1016/S1464-1917(00)00084-2","url":null,"abstract":"<div><p>Acceleration of charged particles, and emissions of electromagnetic waves over a wide range of frequencies, occur in the auroral region of the terrestrial magnetosphere. Many interesting results concerning such phenomena were presented at the second EGS Alfvén conference held in Stockholm during May 1999. We present a summary of some of these results. Our presentation includes recent investigations of the mechanisms accelerating electrons both upward and downward along the geomagnetic field in the auroral region, and of the waves causing energization and upward outflow of ionospheric ions. Wave phenomena such as Auroral Kilometric Radiation and various types of Solitary Waves are also discussed.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 3-12"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00084-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91669473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Radar: Is it a new technology applicable to water level gauging? 雷达:它是一种适用于水位测量的新技术吗?
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(01)95020-2
S Kranz, T Zenz, U Barjenbruch
{"title":"Radar: Is it a new technology applicable to water level gauging?","authors":"S Kranz,&nbsp;T Zenz,&nbsp;U Barjenbruch","doi":"10.1016/S1464-1917(01)95020-2","DOIUrl":"10.1016/S1464-1917(01)95020-2","url":null,"abstract":"<div><p>The methods of water-level gauging used in some countries (float method with float shaft and station house) require costly investments and need permanent maintenance. Radar-sensor techniques for water-level measurements might be a cost-saving alternative. The paper presents practicability studies of radar sensor applications in water gauging and identifies the limits of applicability. Moreover, first experiences with radar sensors for wave-height analysis are reported.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 10","pages":"Pages 751-754"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)95020-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90365947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
The shape and evolution of lower hybrid density cavities observed by FREJA 用FREJA观察低杂化密度空腔的形状和演化
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(00)00110-0
S.H. Høymork , H.L. Pécseli , B Lybekk , J. Trusen , A. Eriksson
{"title":"The shape and evolution of lower hybrid density cavities observed by FREJA","authors":"S.H. Høymork ,&nbsp;H.L. Pécseli ,&nbsp;B Lybekk ,&nbsp;J. Trusen ,&nbsp;A. Eriksson","doi":"10.1016/S1464-1917(00)00110-0","DOIUrl":"10.1016/S1464-1917(00)00110-0","url":null,"abstract":"<div><p>A large number of narrow density cavities (50 m wide in the direction perpendicular to the magnetic field) are observed by the FREJA satellite. These cavities are correlated with electric field enhancements in the frequency range of Lower Hybrid waves. By closer inspection of individual cavities it is shown that they have a Gaussian shape across the magnetic field. It is also observed that the narrowest cavities are the shallowest ones and the depths of individual cavities are only weakly related to the amplitudes of the corresponding electric field fluctuations. The observed phenomenon is unlikely to be explained by a collapse theory for lower-hybrid waves.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 213-217"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00110-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91099043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Sulphate particles from subsonic aviation: impact on upper tropospheric and lower stratospheric ozone 亚音速航空的硫酸盐颗粒：对对流层上层和平流层下层臭氧的影响
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(01)00048-4
G. Pitari , E. Mancini , A. Bregman , H.L. Rogers , J.K. Sundet , V. Grewe , O. Dessens
{"title":"Sulphate particles from subsonic aviation: impact on upper tropospheric and lower stratospheric ozone","authors":"G. Pitari ,&nbsp;E. Mancini ,&nbsp;A. Bregman ,&nbsp;H.L. Rogers ,&nbsp;J.K. Sundet ,&nbsp;V. Grewe ,&nbsp;O. Dessens","doi":"10.1016/S1464-1917(01)00048-4","DOIUrl":"https://doi.org/10.1016/S1464-1917(01)00048-4","url":null,"abstract":"","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 8","pages":"563-569"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00048-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72217827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Auroral particle acceleration by waves 极光粒子被波加速
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(00)00099-4
R. Bingham , R.A. Cairns , R.O. Dendy , V.D. Shapiro , P.K. Shukla , L. Stenflo
{"title":"Auroral particle acceleration by waves","authors":"R. Bingham ,&nbsp;R.A. Cairns ,&nbsp;R.O. Dendy ,&nbsp;V.D. Shapiro ,&nbsp;P.K. Shukla ,&nbsp;L. Stenflo","doi":"10.1016/S1464-1917(00)00099-4","DOIUrl":"10.1016/S1464-1917(00)00099-4","url":null,"abstract":"<div><p>The role of waves in accelerating both electrons and ions in the auroral zone is discussed. Various wave generation mechanisms and acceleration processes including acceleration within cavitons and nonlinear potential structures are analysed. The wave modes which we consider include waves such as kinetic Alfvén waves, and lower-hybrid waves. In some cases wave amplitudes are found to be large enough for strong turbulence effect to play a significant role in the particle dynamics. These effects manifest themselves in the formation of caviton structures and large scale density striations creating local acceleration regions. A theoretical description of the different nonlinear processes responsible for plasma modification and acceleration will be presented.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 133-144"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00099-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76243338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
The time-weighted magnetic indices ap(τ), PC(τ), AE(τ) and their correlation to the southern high latitude ionosphere 时间加权磁指数ap(τ)、PC(τ)、AE(τ)及其与南方高纬电离层的相关性
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 DOI: 10.1016/S1464-1917(01)00008-3
L. Perrone , G. De Franceschi , Gulyaeva
{"title":"The time-weighted magnetic indices ap(τ), PC(τ), AE(τ) and their correlation to the southern high latitude ionosphere","authors":"L. Perrone ,&nbsp;G. De Franceschi ,&nbsp;Gulyaeva","doi":"10.1016/S1464-1917(01)00008-3","DOIUrl":"10.1016/S1464-1917(01)00008-3","url":null,"abstract":"<div><p>In this investigation different data transformations of the ionospheric characteristic foF2 from high latitude stations in the Southern Hemisphere are considered and correlated with time weighted accumulation of the geomagnetic indices ap, AE and PC. The analysis, performed during periods of severe magnetic activity, shows a decrease in foF2 as a consequence of geomagnetic perturbations and a characteristic response recovery time <em>t</em> ranged between 15–20 hours. The best correlation coefficients are obtained by comparing the time weighted accumulation of the auroral index AE and a data transformation based on the ratio NmF2(t)/NmF2<sub>M</sub> where NmF2(t) is the hourly maximum electron density at the F2 peak layer and NmF2<sub>M</sub> is its monthly median value.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 5","pages":"Pages 331-334"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00008-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76439392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信