吉林市城区地下水源热泵浅层地热能开发利用前景分析     

高山 《吉林地质》2014,(1):105-107

地下水源热泵浅层地热能是指地下水在抽水-回灌过程中,利用水源热泵提取水中的热能,或用于空调制冷产生的能量转换。地下水源热泵地热能是浅层地热能的一种主要类型。地下水源热泵浅层地热能是一种可循环利用、环保的新型能源,逐渐为人们认识,具有广泛的开发前景。本文简要介绍吉林市城区地下水源热泵浅层地热能条件,开发利用前景分析。  相似文献   

Potentials of monitoring rock fall hazards by GPR: considering as example the results of Salzburg   总被引：1，自引：0，他引：1  

Karl-Heinz Roch  Werner Chwatal  Ewald Brückl 《Landslides》2006,3(2):87-94

A part of the IUGS-UNESCO research project "Landslide Hazard Assessment and Cultural Heritage" (IGCP-Project No. 425) includes testing the application of geophysical methods for assessing hazard risks to people and cultural assets. In this work, Austria contributed with a study on the assessment of rock-fall hazards. As the Old Town of Salzburg is a prime example of such hazards, systematic GPR-measurements were made on major rock surfaces. The aim of the exploration with GPR was to assess the potential of the method for monitoring rock walls. That is, whether structures in the rock mass which could become important when considering the risk of a rock fall, can be imaged. To manage this problem successfully, moving the antenna over the rough rock surface was made as regular as possible. The effects of vegetation lifting the antenna from the rock surface and of overhanging regions could not be avoided. Due to the loss of coupling of the antenna and the change of radiation pattern, some interference of the records occurred. Thus, only after processing could it become clear which reflections came from within the rock. A three-dimensional survey of discontinuities in the rock requires accurate mapping of the rock surface by photogrammetric methods, to get a digital terrain model for the analysis of the GPR records. The results of repeated measurements have proved to be of essential relevance. They have shown that it is possible to reveal changes with time. For the interpretation of such observations, modeling is a very useful tool.  相似文献   

平桥南区页岩气水平井钻井优化设计   总被引：1，自引：1，他引：0       下载免费PDF全文

龙志平  王彦祺  周玉仓  贺庆  刘广庆 《探矿工程》2017,44(12):34-37

在分析平桥产建井位部署特点及区块地质条件的基础上,系统总结了该区块页岩气水平井钻井存在的防漏堵漏工艺、钻井提速技术、水平段施工工艺等方面存在的问题,通过对平台部署、井身结构、井眼轨道、“井工厂”钻井模式、钻头选型、钻井液体系及固井工艺等方面的深入研究和优化,形成了平桥南区块页岩气水平井钻井优化设计方案,以实现平桥南区页岩气产建的高效开发。  相似文献   

钻探技术在煤矿水害防治工作中的应用          下载免费PDF全文

王永全  周兢 《探矿工程》2017,44(11):35-41

钻探作为煤矿水害防治工作一种重要的技术手段,得到了广泛的应用。煤矿大口径排水井钻进技术、底板多分支水平井地面定向钻进及注浆加固改造技术、井下定向探（疏）放水钻进技术、注浆封堵突水通道钻探技术和矿井突水灾害快速钻进救援技术等煤矿防治水钻探技术,在煤矿水害防治工作中得到了广泛应用,取得了良好效果。加强防治水钻探配套设备的研发和相关钻探工艺技术研究,将有力促进煤矿水害防治工作的发展。  相似文献   

Interpretation of pumping test data from large diameter wells on an oceanic island   总被引：1，自引：0，他引：1  

V. S. Singh 《Environmental Geology》1999,38(2):168-170

 Estimation of aquifer parameters is vital for the assessment of groundwater potential and groundwater flow regime. On an oceanic island where fresh water lens is fragile and sensitive to various stresses, it is even more essential that in order to assess the potential of fresh water lens and the effect of various stresses on the fresh groundwater regime the parameters should be representative to the field hydrogeological set up. Pumping tests conducted on existing large diameter wells on an oceanic island have been analyzed. A finite difference method has been used to take into account the well storage, partial penetration and upconing effect into the aquifer. Forward modeling has been carried out to estimate aquifer parameters from the pumping test data. Field examples are described. Received: 15 June 1998 · Accepted: 25 August 1998  相似文献   

In-situ geotechnical experimentation and stability evaluation of an instrumented 180 m×70 m×12.5 m fill dike constructed on laminated soft ground     

A. S. Al-Homoud  Colin Makinson  A. B. Tal  J. G. Penman 《Environmental Geology》1999,39(2):177-196

 An instrumented trial-fill dike was constructed on soft, laminated soils of the Lisan Peninsula foreshore of the Dead Sea. The earthwork had base dimensions of 180 m by approximately 70 m wide and was raised in two stages to a maximum height of 12.5 m above original ground level. The geotechnical data of the dike were monitored in order to: assess the short- and long-term strength of the foundation, obtain and analyze the pore-pressure response of the foundation soils for potential use in construction control, obtain data on embankment settlement in order to refine end-of-construction and post-construction settlement assessments, and optimize the height of the dike to be constructed by providing information on the construction sequence for use in calculation of capital costs and alternative layouts and dike heights. The successful completion of the trial dike has demonstrated that steep-side dikes up to 12.5 m high can be constructed rapidly on soft soils. The construction of the trial dike has therefore proved a very substantial benefit to the evaluation of the likely performance of a dike constructed along the Lisan shore. The key factor which made this fast construction possible was the unexpected, very rapid consolidation of the majority of the foundation soil which has been shown to occur. The principal observations from the trial dike were: (1) end of construction settlements may be calculated using drained stiffnesses where E′/s_{u initial} has a value of around 65; (2) post-construction settlements can be calculated using a coefficient of secondary compression, Cα equal to 0.015; (3) a rapid increase in undrained shear strength occurred when loading the soil up to a value of s_u equal to around 30 kPa. The value of s_u/σ_v′ was as high as 0.5 at this stage. With further loading the strength increase was more modest and s_u/σ_v fell to around 0.25 for a vertical effective stress of 160 kPa; (4) for the undrained stability analyses of the trial dike, the mean vane shear-strength profile provided an appropriate assessment of the short-term factor of safety against failure, 5) For the drained stability analyses of the trial dike, lower bound effective strength parameters for the foundation and embankment fill (c′=0, φ′=30° and c′=2 kN/m², φ′=33°, respectively), combined with field measurements of end of construction pore water pressures provided an analysis which was broadly compatible with the undrained analysis; and (6) the trial dike has been stable, pre- and post-construction, because of the well drained nature of its foundation which prevented the build up of high pore water pressures and led to rapid consolidation. Received: 22 June 1998 · Accepted: 30 October 1998  相似文献   

METHODS FOR MONITORING AND ASSESSING SANDY DESERTIFICATION IN THE NORTH CHINA     

中国沙漠 《中国沙漠》1999,19(1):2

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｌａｎｄｄｅｇｒａｄａｔｉｏｎｈａｓｂｅｅｎｓｐｒｅａｄｉｎｇｑｕｉｃｋ－ｌｙｏｖｅｒｌａｓｔｄｅｃａｄｅｓｉｎｔｈｅＮｏｒｔｈＣｈｉｎａ,ｗｈｉｃｈｉｍ－ｐａｃｔｅｄ１１ｐｒｏｖｉｎｃｅｓａｎｄ２１２ｃｏｕｎｔｉｅｓ...  相似文献   

Monitoring soil moisture dynamics using satellite imaging radar in northeastern Jordan     

K. J. Tansey  A. C. Millington  A. M. Battikhi  K. H. White 《Applied geography (Sevenoaks, England)》1999,19(4):603

This paper describes how synthetic aperture radar (SAR) data from the European Environmental Remote Sensing (ERS) satellite series were used to derive estimates of near-surface soil moisture for seasonally vegetated and bare soil surfaces in the area of the Jordan Badia Research and Development Programme (BRDP). Data were acquired between March 1995 and April 1998, covering both wet and dry seasons. A surface scattering model was calibrated using field data: first to understand how soil moisture affects the SAR signal and, secondly, to predict the response of the SAR signal to changes in volumetric soil moisture. Good agreement between predicted and observed estimates was obtained. Model inversion allowed soil moisture predictions to be made that were deemed realistic in terms of soil moisture values.  相似文献   

Complex effusive events at Kīlauea as documented by the GOES satellite and remote video cameras     

A. J. L. Harris  C. R. Thornber 《Bulletin of Volcanology》1999,61(6):382-395

 GOES provides thermal data for all of the Hawaiian volcanoes once every 15 min. We show how volcanic radiance time series produced from this data stream can be used as a simple measure of effusive activity. Two types of radiance trends in these time series can be used to monitor effusive activity: (a) Gradual variations in radiance reveal steady flow-field extension and tube development. (b) Discrete spikes correlate with short bursts of activity, such as lava fountaining or lava-lake overflows. We are confident that any effusive event covering more than 10,000 m² of ground in less than 60 min will be unambiguously detectable using this approach. We demonstrate this capability using GOES, video camera and ground-based observational data for the current eruption of Kīlauea volcano (Hawai'i). A GOES radiance time series was constructed from 3987 images between 19 June and 12 August 1997. This time series displayed 24 radiance spikes elevated more than two standard deviations above the mean; 19 of these are correlated with video-recorded short-burst effusive events. Less ambiguous events are interpreted, assessed and related to specific volcanic events by simultaneous use of permanently recording video camera data and ground-observer reports. The GOES radiance time series are automatically processed on data reception and made available in near-real-time, so such time series can contribute to three main monitoring functions: (a) automatically alerting major effusive events; (b) event confirmation and assessment; and (c) establishing effusive event chronology. Received: 12 January 1999 / Accepted: 13 July 1999  相似文献   

Optimization methodology for a river temperature monitoring network for the characterization of fish thermal habitat     

Anik Daigle  Arnaud Caudron  Laure Vigier  Hervé Pella 《水文科学杂志》2017,62(3):483-497

A methodology for planning an optimized river water temperature monitoring network is presented. The methodology is based on sampling of the physio-climatic variability of the region to be monitored. Physio-climatic metrics are selected to describe the study region, based on principal component analysis. The sites to be monitored are then identified based on a k-means clustering in the multidimensional space defined by the selected metrics. The methodology is validated on an existing dense water temperature network in Haute-Savoie, France. Different configurations of more or less dense network scenarios are evaluated by assessing their ability to estimate water temperature indices at ungauged locations. An optimized network containing 83 sites is found to provide satisfactory estimations for seven ecologically and biologically meaningful thermal indices defined to characterize brown trout thermal habitat.  相似文献