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长江中游鄱阳湖及江西江段水患区新构造 总被引：1，自引：1，他引：1
对长江中游鄱阳湖及江西江段水患 区内的新构造运动特点及证据进行了详细介绍，并对区内的第四纪冰川和地震进行了系统分类描述。 相似文献
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根据确定的水患危险性分区评价的原则和评价方法,对长江江西江段及鄱阳湖地区进行水患危险性分区评价研究,主要划分为高风险区、一般风险区两个大类,高风险区主要有九江市区高风险区、南昌市区高风险区及永安堤段高风险区;一般风险区有赣、抚尾间风险区、信江尾间风险区、饶河尾间风险区及修河尾间风险区、滨江县级城市风险区等。 相似文献
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洞庭湖和鄱阳湖泥沙冲淤特征及三峡水库对其影响 总被引：6，自引：0，他引：6
长江中游江湖关系复杂,分布有中国第一、二大淡水湖泊,江湖关系演变对防洪、生态等影响重大。通过分析反应长江中游洞庭湖和鄱阳湖泥沙冲淤的实测水沙和地形资料,初步掌握了湖区泥沙冲淤特征及主要影响因素,并着重探讨了三峡水库蓄水对两湖泥沙冲淤的影响。结果表明,近10年洞庭湖和鄱阳湖湖区泥沙淤积速度明显减缓,部分年份出现冲刷,其中洞庭湖湖区泥沙沉积率下降主要由来沙减少引起,三峡水库拦沙作用的影响明显;鄱阳湖区冲刷主要集中在入江水道,采砂活动影响显著,三峡水库蓄水影响尚不明显。 相似文献
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1998年长江流域发生特大洪水，沿江受灾人口232万，直接经济损失超过2000亿元。其中江西省共有93个县(市、区)、1787个乡镇、2081．9万人受灾，因灾死亡313人，损坏房屋189．2万间，倒塌91．2万间，农作物受灾面积152．6万hm^2，绝收77．8万hm^2，3．49万家工矿企业因灾停产或部分停产。整个江西省因灾造成直接经济损失376．4亿元，其中水利设施直接经济损失37．6亿元。2000～2002年开始实施“长江中游主要水患区环境地质调查评价”项目，其目的是查明长江中游水患区洪涝灾害生成的地质背景，论证控制江湖演变及洪水致灾的地质作用，提出符合地学规律的防灾对策，为长江中游综合整治规划提供地质依据。文章从鄱阳湖区的地貌、地基土的基本特征入手，就鄱阳湖区圩堤渗透稳定性及软基沉陷进行了工程稳定性评价，为鄱阳湖区的防洪治水、水利建设等提供依据。 相似文献
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鄱阳湖水患区危险性分区评价 总被引：1，自引：0，他引：1
水患危险性分区评价就是在查明区域环境地质背景的前提下,对水患灾害发生的规模、强度、频次,灾害活动的孕育条件、变化规律,以及成灾过程中密切相关的人类社会经济特征,诸如人口、财产、工程建设活动、资源开发、经济发展水平、防灾能力等进行调研,同时还必须对水患的危害范围、破坏程度进行调研,并在此基础上对其做出全面而综合的评价。简言之,水患危险性分区评价就是分区对其危险性、易损性、破坏损失性、防灾工程效益进行全面而综合的评价。据此,本文将鄱阳湖水患区划分为3个高风险区(南昌市区、九江市区及永安堤段高风险区)和5个一般风险区(赣江尾闾、抚河尾闾、修河尾闾、信江尾闾及饶河尾闾一般风险区)。 相似文献
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江西地质旅游资源特点综述 总被引：6，自引：2，他引：4
张树明 《华东地质学院学报》2000,23(3):235-241
在阐述了地质旅游资源含义的基础上,对江西的地质旅游资源特点进行了分析,总结,对今后旅游业发展提出了建议,并对庐山、井冈山、鄱阳湖等江西主要旅游景点进行了简单介绍。 相似文献
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鄱阳湖畔，雁阵鹤鸣，钻机欢歌。在人们欢庆新千年到来之际，鄱阳湖水患区环境地质调查项目钻探取样工程正式开钻并进展顺利，这是我省新世纪在鄱阳湖首次实施的系统取样工程。 昔日水天一色的鄱阳湖，今朝已草滩毕露。江西省地质调查院抓住枯水季节这一有利时机，精心组织和施工，通过系统采集湖中沉积样品，应用当代先进的测试技术和手段，重点查明鄱阳湖第四纪一万年以来的沉积物成分、厚度、地质年龄，计算其淤积速率，恢复不同历史时期的古地理、古气候、古环境，研究鄱阳湖的形成变迁规律，预测鄱阳湖的发展演化趋势，探讨江（长江）… 相似文献
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以往许多学者习惯于将造山作用与造盆作用分开来研究，且认为赣北庐山－鄱阳湖仅在第四纪形成，笔者通过对庐山及其中鄱阳湖地区区域深部构造背景及其本地质特征的分析，将庐山－鄱阳湖的造山－造盆作用作为一个整体来进行研究，主要论述了其造山－造盆作用的特征，即先天条件，临产条件和后天条件。在此基础上，将庐山－鄱阳湖的造山－造盆作用划分为前震旦纪基础阶段，震旦纪－早二叠世休眠阶段，晚二叠世－早第三纪雏形阶段及晚第 相似文献
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Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
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Jiayu Rong Michael Melchin S. Henry Williams Tatyana N. Koren Jacques Verniers 《《幕》》2008,31(3):315-318
The Global Stratotype Section and Point （GSSP） for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy （SSS） proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy （ICS）. The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob＇s Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs. 相似文献
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Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
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Important tendencies in development of the world mineral-resources sector at the beginning of the 21st century were an increase in production and consumption of mineral materials differentiated by types of metals and nonmetallic mineral raw materials, by countries and regions, as well as the concentration of the production of mineral raw materials in a small number of countries, and a reduction in industrial reserves of minerals in the world economy, even at the current stage of their extraction. These tendencies should be taken into account in working out a strategy for development of the Russian mineral raw-material base. 相似文献
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Fouad N. Ibrahim Dr. 《GeoJournal》1988,17(1):133-141
Taking the example of W Sudan, an analysis of the climatic incidents leading to the two recent famine disasters is made. On this natural background, the human side is investigated. Focus is directed towards the fragile economic structure of the famine-prone population groups. An early-warning system for famine in the Sahelian Zone is proposed taking grain production and storage, livestock development and the relationship between the prices of livestock and grain as major indicators. 相似文献
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东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。 相似文献
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郯庐断裂南段研究进展与断裂性质讨论 总被引：13，自引：3，他引：13
据1：5万区域地质调查和专题研究资料，就郯庐断裂带是否南延与消失的原因，其与大别—苏鲁造山带交截形成的假位错效应，以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上，讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。 相似文献
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The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献