洛阳市龙门温泉成因探讨   总被引：1，自引：1，他引：1  

杨国华  吴奇 《水文地质工程地质》2003,30(6):58-61

通过对龙门温泉所处地区地质构造、水文地质条件的分析,根据温泉的水文地球化学特征,从温泉的水源、热源、构造等方面阐明了龙门温泉的成因,并对温泉的热储温度、循环深度作了较为系统的论证。  相似文献   

兰村泉域地下水可持续开发利用与综合管理措施     

员占英 《地下水》2003,25(2):80-82

兰村泉域水源地是太原市重要水源地，担负着太原市城市居民生产、生活用水任务，但是，由于多年来不合理开采，造成区域地下水水位严重下降、水质不断恶化，给太原市经济发展带来不良影响，为了适应太原市率先发展，保征兰村泉域地下水可持续利用以支撑太原市经济社会可持续发展，在引黄入并到来之际，对兰村泉域地下水开发利用提出探讨性意见及保护管理措施。  相似文献   

点群分析法在泉域子系统划分中的应用——以山西延河泉域为例     

张玉良 《中国煤田地质》2003,15(3):30-31,56

应用Q型点群分析这种数学地质方法，运用水化学与同位素水样资料，对山西延河泉域进行了子系统的划分，取得了满意的效果，并在生产实践中得到了证实与应用。  相似文献   

古尔班通古特沙漠腹地春季土壤水分空间分异研究   总被引：18，自引：7，他引：18  

赵从举  雷加强  王雪芹  周长海 《干旱区地理》2003,26(2):154-158

土壤水分条件是古尔班通古特沙漠荒漠植被发育的最主要的制约因子，春季土壤水分对该区植被发育更具决定作用。通过野外标定，利用中子水分仪对原始沙丘、工程扰动沙丘不同地貌部位土壤水分动态进行系统监测，结果表明：春季土壤水分受地貌部位和人为干扰等因素影响而出现明显的空间分异，整体表现为垄间低地高于垄顶，人为扰动沙面又高于有植被覆盖的沙面。春季土壤水分的时间变化表现为初春(3—4月)土壤水分的补给期和春末夏初(5—6月初)的土壤水分损耗期。认为植被状况、降雨、地形和人为扰动等因素对土壤水分影响较大。  相似文献   

郑州地区春季旱涝特征分析及趋势预测     

张霞  林丽 《河南气象》2002,(1):18-19

利用郑州站1951－2000年的降水和气温资料，对郑州地区的旱涝特征进行分析，并根据农谚筛选出与春季降水相关较好的因子，组建了春季旱涝预测方程。经试报和历史回代，方程准确率和历史拟合率均较好。  相似文献   

颈椎间盘膨、突出症CT影像与CR影像分析     

孙璐  闫罡  王慧芝 《CT理论与应用研究》2002,11(2):45-47

目的：通过CT与CR检查分析，进一步提高对颈椎间盘膨，突出症的影像认识。材料与方法：100例患者均行CT与CR检查，个别病例行CTM检查，结果 因颈椎间隙通常比胸腰椎间隙窄，CT扫描受扫描层数的限制，致使颈椎间盘显示不够完全，但CT摄影是比较简便的方法，而且是有价值的诊断方法。结论：对CT与CR两种影像检查方法进行分析，能够加深对颈椎间盘膨，突出症的影像认识，并结合临床症状，病史，做出准确的诊断。  相似文献   

Tree-Ring-Based Spring Temperature Patterns over the Past Four Centuries in Western Himalaya   总被引：1，自引：0，他引：1  

Ram R. Yadav  Jayendra Singh 《Quaternary Research》2002,57(3):299

A network of 12 tree-ring width chronologies of Himalayan cedar (Cedrus deodara) from the western Himalayan region, India, has been used to reconstruct mean spring (March–May) temperature variations back to A.D. 1600. The most conspicuous feature of the temperature reconstruction is the long-term cooling trend since the late 17th century that ended early in the 20th century. The warmest 30-yr mean for the 20th century was recorded during 1945–1974. However, this warming, in the context of the past four centuries is well within the range of natural variability, since warmer springs of greater magnitude occurred in the later part of the 17th century (1662–1691).  相似文献   

滇西地震预报实验场区温泉地球化学与断裂活动的关系   总被引：1，自引：0，他引：1  

李如陶  李四海 《大地构造与成矿学》1997,21(2):129-136

本文介绍了滇西地震预报实验场区（下文简称实验场区）主要温泉的水热活动特征、水化学成分特征、溶解气体的化学成分特征、及溶解气中CO2气体的碳同位素比值特征，并讨论了它们与构造活动的关系，取得了一些有意义的结果。  相似文献   

山东半岛温泉的地热属性及其特征   总被引：9，自引：3，他引：9  

栾光忠  刘红军  刘冬雁  王文正 《地球学报》2002,23(1):79-84

从山东半岛所处的板块构造位置和局部的控热构造入手，根据地热传导的理论，对山东半岛温泉的地热属性进行研究分析，认为山东半岛温泉地热属性为濒临板缘高温地热带的板内中低温地热系统，它以偏高的大地热流值为地热背景，以局部控热构造聚敛的大地热流为热源，以地形高差影响和相应的水力压差作用为动力，入渗的大气降水吸收岩石中的热量而被加热，并沿断裂出露形成温泉地热水。以此建立起温泉的构造模式。  相似文献   

An unusual modern silica–carbonate sinter from Pavlova spring, Ngatamariki, New Zealand     

Kathleen A. Campbell†  K. A. Rodgers‡  Jane M. A. Brotheridge  P. R. L. Browne§ 《Sedimentology》2002,49(4):835-854

ABSTRACT A silica–carbonate deposit is forming from the dilute alkali chloride waters of Pavlova spring, a small thermal pool and outflow channel (85 to <40 °C), situated at the northern extent of the South Orakonui area of the Ngatamariki geothermal field, Taupo Volcanic Zone (TVZ), New Zealand. It is one of a small but growing number of thermal spring features known to yield deposits of mixed mineralogy. At Pavlova, a distinctive, crustose, chalk‐white, meringue‐like sinter, comprising non‐crystalline opal‐A silica with subordinate calcite, is actively precipitating both around the margins of and as small islets within the spring, with an average accumulation rate of ≈ 2 mm year^?1. Both emergent and partly submerged substrates host the sinter, including fallen pine branches, twigs, needles and cones, gum leaves, grass blades, bracken fronds, pumice, sediment and microbial mats. The sinter is thin (25–35 mm thickness), finely laminated and contains three distinct types of stacked horizons. Submerged basal layers constitute stratiform to undulatory microstromatolites with pseudocolumns, which grew outwards and upwards on narrow twig nuclei. Emergent middle layers comprise discontinuous, spicular microstromatolites (to 10 mm height), with prostrate and erect microbial filaments, silica spheres and silicified mucus, overlain by silicified structures of probable fungal origin. In places, lower and middle sinter layers are capped by white, smooth, convex surfaces that coalesce into subdued, curved ridges, resembling laterally continuous peaks of egg‐white meringue. The meringue is internally laminated, with fossilized microbes preserved in thin horizons. Small lensoid masses of calcite crystals nestle between silica laminae throughout the sinter. The near‐neutral (pH ≈ 7·2) spring water is a dilute chloride‐carbonate type (HCO≈ 470 µg g^?1, Cl^–≈ 600 µg g^?1) with low (≈ 50 µg g^?1), typical of TVZ thermal fields where deep chloride fluid mixes with CO₂‐rich, steam‐heated shallow waters before discharge. The hot water changed little in composition from 1993 to 1999 and, despite dilution by meteoric waters, contains sufficient SiO₂ (≈ 220 µg g^?1) for opal‐A to deposit at the surface upon cooling. However, the concentration of Ca²⁺ (≈ 6 µg g^?1) is such that the precipitation of calcite is not expected without modification of spring waters. Precipitation occurs by evaporation of thin water films at exposed substrate surfaces, via meniscoid as well as capillary creep (wicking), through porous sinter horizons and across emergent vegetative surfaces in contact with spring water or steam. The height of the deposit above the water surface is restricted by the upper limit of moisture bathing these substrates. Splash and spray are not involved in the formation of Pavlova spicular microstromatolites, as is the case for other texturally similar deposits from hotsprings elsewhere. This young (< 15 years), mineralogically and morphologically complex hot‐spring deposit exhibits > 10 times lower accumulation rates than typical siliceous sinters in the TVZ, and deposition of both silica and calcite is controlled by microchemical conditions and local temperature gradients, rather than by bulk spring water chemistry.  相似文献