Seismic Risk Maps of Taiwan Areasin the Period from 2001 to 2010     

Cheng Kuei-Hsiang 《中国地震研究》2001,15(3):311-320

INTRODUCTIONSeveMmethdsdPOtential analyslsfor medium－and short－termpredlctlon dl’l;lln shocks weredevelopedbaseduponthe pnnclpledInaccufatemeasurementoffOCfOCustheoryaMthepattemdmainshocks．These analytic methods can be used to predict strong earthop拙es In shallow layers on thesubducting plate boundeq In squeezed zones．More than a half of strong earthquakes In the world。located inthe shallow depth tthe suMuctingplate boundw In s仰eezed zones．This paPerfirst Statesthe philoso…  相似文献   

浅地层剖面仪在水域工程勘察中的应用   总被引：7，自引：0，他引：7  

魏恒源 《华南地震》1996,16(4):73-79

扼要介绍了水上浅地层剖面仪的方法技术，列举了该法在浅海，内河和湖泊减种典型环境及相应的地质条件下勘测所得到的剖面记录及地质解释结果，指出了运用该方法所能解决的工程地质问题。  相似文献   

地下水浅埋条件下冬小麦和大豆土壤水分动态预报模型研究   总被引：5，自引：0，他引：5       下载免费PDF全文

毛飞张佳华  卢志光金之庆 《应用气象学报》2003,14(4):479-486

用统计方法和水量平衡法推导出江淮地区潜水蒸发经验计算模型。利用农田水分平衡原理分别在江淮地区建立了引入潜水蒸发量和没有引入潜水蒸发量的冬小麦和大豆土壤水分动态预报模型,并对这两种模型在地下水浅埋条件下的预报准确度进行比较。1980年的比较结果是:当预报时效为10天时,两种作物7个时段的土壤水分平均绝对误差前者为8.2 mm,后者为20.1 mm,平均相对误差分别为2.8%和6.8%。引入潜水蒸发量后,冬小麦和大豆土壤水分动态预报模型的预报准确度明显提高。  相似文献   

Restoration of submerged vegetation in shallow eutrophic lakes – A guideline and state of the art in Germany     

Sabine Hilt  Elisabeth M. Gross  Michael Hupfer  Harald Morscheid  Jens Mhlmann  Arnulf Melzer  Jens Poltz  Stefan Sandrock  Eva-Maria Scharf  Susanne Schneider  Klaus van de Weyer 《Limnologica》2006,36(3):155-171

One of the most serious problems caused by eutrophication of shallow lakes is the disappearance of submerged macrophytes and the switch to a turbid, phytoplankton-dominated state. The reduction of external nutrient loads often does not result in a change back to the macrophyte-dominated state because stabilising mechanisms that cause resilience may delay a response. Additional internal lake restoration measures may therefore be needed to decrease the concentration of total phosphorus and increase water clarity. The re-establishment of submerged macrophytes required for a long-term stability of clear water conditions, however, may still fail, or mass developments of tall-growing species may cause nuisance for recreational use. Both cases are often not taken into account when restoration measures are planned in Germany, and existing schemes to reduce eutrophication consider the topic inadequately. Here we develop a step-by-step guideline to assess the chances of submerged macrophyte re-establishment in shallow lakes. We reviewed and rated the existing literature and case studies with special regard on (1) the impact of different internal lake restoration methods on the development of submerged macrophytes, (2) methods for the assessment of natural re-establishment, (3) requirements and methods for artificial support of submerged macrophyte development and (4) management options of macrophyte species diversity and abundance in Germany. This guideline is intended to help lake managers aiming to restore shallow lakes in Germany to critically asses and predict the potential development of submerged vegetation, taking into account the complex factors and interrelations that determine their occurrence, abundance and diversity.  相似文献   

Multi-Layer Strain Rate Field Controlled by Netlike Plastic-Flow in the Lithosphere in Central-Eastern Asia     

Wang Sheng-zu 《中国地震研究》2006,20(3):326-338

INTRODUCTIONAccording to the“netlike plastic-flow (NPF)”continental dynamics model ( Wang, 1993a ,1993b; Wang,et al .,2001c) ,the continental lithosphere generally includes 4 tectonic deformationlayers frombottomtotop:the NPFlayer (i .e .thelowerlithosphere ,includingthelithospheric mantleandlower crust) ,the transitional weak layer distributed discontinuously (i .e .the so-called low-velocity/high-conductivitylayer) ,the shear fracturinglayer (i .e .the seismogenic layer inthe upperc…  相似文献   

江苏省里下河(兴化-泰州)地区浅表沉积物特征及古地理环境演变     

冯金顺  孙磊  葛云  徐广志  邵家骥 《江苏地质》2007,31(2):101-107

里下河地区浅部沉积物多为全新世中、晚期堆积,多数地区缺失全新世早期沉积。沉积物以淤泥质亚粘土、亚粘土、亚砂土,粉砂质淤泥、淤泥质粉砂、淤泥及泥炭为特征。沉积前的古地貌为四周高、中间低的碟形盆地。古气候经历了温湿—暖湿—温湿—温干的变化过程。区内曾有两次海侵,第一次海侵发生在全新世早中期,范围几乎遍及全区;第二次海侵发生在全新世晚期,规模小、范围窄、时间短,为海水沿江河倒灌、回溯形起。该区古环境自全新世以来经历了浅水海湾—古泻湖—湖沼地及平原的演变过程,最终形成现今河湖稠密的低凹平原。  相似文献   

The history of Jonsmod 1981–2006     

Phil Dyke 《Ocean Dynamics》2007,57(4-5):239-244

This is a history of shallow sea modelling developments as viewed through the Jonsmod modelling conferences over the past 25 years. The conferences are reviewed, and what emerges is a coherent progression to present-day modelling. We also see advances in computing and oceanographic observation, although these are, of course, incidental to the modelling from the point of view of these conferences.  相似文献   

1976年唐山地震发震断裂的活动性研究   总被引：10，自引：5，他引：5       下载免费PDF全文

李建华  郝书俭 《地震地质》1998,20(1):28-33

震后野外考察及航空摄影发现的地裂缝带,说明唐山断裂与１９７６年唐山７．８级大地震的发震构造有密切关系。用卫星遥感信息和浅层地震勘探结果对唐山断裂的活动性做了新的研究。卫星图像解释结果表明：震前一年多时间内,ＮＥ向的唐山断裂被ＮＮＷ向断裂截切而ＮＷＷ向断裂受到牵引,因而显示出右旋走滑的活动形迹。浅层地震勘探结果则证明,唐山断裂是倾向ＮＷ,高倾角的右旋走滑正断层,它断错了全新统（Ｑ４）、晚更新统（Ｑ３）、中更新统（Ｑ２）和早更新统（Ｑ１）地层  相似文献   

Characteristics of shallow geothermal fields in major cities of Tibet Autonomous Region     

YANG Hai-jun  DONG Jian-xing  SUN Dong  HUANG Rui 《地下水科学与工程》2014,7(1):77-85

Based on the project titled “Investigation and evaluation of shallow geothermal energy in major cities of Tibet Autonomous Region”, the distribution characteristics and occurrence conditions of shallow geothermal fields in these cities were introduced in this paper. To this end, relevant data in Lhasa, Shigatse and Nyingchi Cities through vertical thermometry was a focus, so as to analyze groundwater temperature and the distribution law of strata with constant temperature. Then through comprehensive comparisons and analysis of the relationship between groundwater temperature and climate, differences in this aspect of Nagqu City were taken as a typical case to clarify formation of geothermal field and corresponding influence on groundwater temperature, furthermore providing basic data for rational development and utilization of shallow geothermal energy in Tibet Autonomous Region.  相似文献   

Analysis on the law of occurrence of shallow geothermal energy in Zhoukou City of Henan Province,China     

XING Hui  DI Yan-song  YONG Yi 《地下水科学与工程》2014,7(3):282-287

In this paper, through data collection and field investigation, the development and utilization status of shallow geothermal energy in Zhoukou urban area was discussed. Based on the analysis of hydrogeological conditions, rock and soil structure characteristics and field test research, the spatial distribution characteristics of rock and soil in the study area were summarized. The study shows that Zhoukou City is located in the alluvial plain of Huanghuai, and the loose deposits of river alluvial genesis range 0-200 m. These loose deposits and groundwater stored in their pores are the main carriers of shallow geothermal energy. In the central part of the Yinghe River in the middle of the study area, the aquifer thickness is within 200 m, the particle size is coarser, the water-bearing degree and recharge capacity is better. On this basis, the paper uses AHP to evaluate the suitability of shallow geothermal energy development and utilization to guide the rational development and utilization of shallow geothermal energy resources.  相似文献