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本文从日本沿岸选取了28个验潮站及联测的GPS站,利用奇异谱分析（Singular Spectrum Analysis,SSA）和SSA+自回归滑动平均（Auto Regression Moving Average,ARMA）方法预测了2014—2018年的近海海平面变化和地壳垂直变化.并用同时段的验潮及GPS的实际测量值进行验证,结果显示,SSA+ARMA预测的相对海平面精度为0.0357~0.0607 m,地壳垂直运动的精度为0.0049~0.0077 m,绝对海平面的精度为0.0433~0.0683 m,且三者SSA+ARMA的预测结果均优于只用SSA预测的结果.在此基础上本文利用SSA+ARMA预测了日本沿岸2019—2023年的近海绝对海平面变化,结果显示,2019—2023年的平均海面高较往年（2014—2018）升高0.0353 m,2003—2023年绝对海平面的变化率为0.0039 m·a-1,预测结果较为理想. 相似文献
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高压—超高压岩石对合肥盆地侏罗系沉积的贡献 总被引：22，自引：4，他引：22
合肥盆地侏罗系沉积包括防虎山组、三尖铺组、周公山组和凤凰台组。上述地层中砂岩普遍产出碎屑白云母，而且几乎都为多硅白云母，Si原子数多从3．3至3．6（p.f.u），表明大别造山带高压－超高压变质岩石是合肥盆地沉积的重要物源。由於防虎山组地层沉积於早侏罗世，该地层中碎屑多硅白云母的新发现表明大别造山带高压－超高压岩石在早侏罗世时期已经出露地表。 相似文献
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Li Ming Li GuoMin Yang Liao Dang XueYa Zhao ChunHu Hou GuangCai Zhang MaoSheng 《中国科学D辑(英文版)》2007,50(1):36-41
The quantitative assessment of geothermal water resources is important to the exploitation and utilization of geothermal resources. In the geothermal water systems the density of groundwater changes with the temperature, therefore the variations in hydraulic heads and temperatures are very complicated. A three-dimensional density-dependent model coupling the groundwater flow and heat transport is established and used to simulate the geothermal water flow in the karst aquifers in eastern Weibei, Shaanxi Province, China. The multilayered karst aquifer system in the study area is cut by some major faults which control the regional groundwater flow. In order to calibrate and simulate the effect of the major faults, each fault is discretized as a belt of elements with special hydrological parameters in the numerical model. The groundwater dating data are used to be integrated with the groundwater flow pattern and calibrate the model. Simulation results show that the calculated hydraulic heads and temperature fit with the observed data well. 相似文献
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Numerical modeling of geothermal groundwater flow in karst aquifer system in eastern Weibei, Shaanxi Province, China 总被引：2，自引：0，他引：2
LI Ming LI GuoMin YANG Liao DANG XueYa ZHAO ChunHu HOU GuangCai ZHANG MaoSheng 《中国科学D辑(英文版)》2007,50(Z1):36-41
The quantitative assessment of geothermal water resources is important to the exploitation and utilization of geothermal resources. In the geothermal water systems the density of groundwater changes with the temperature, therefore the variations in hydraulic heads and temperatures are very complicated. A three-dimensional density-dependent model coupling the groundwater flow and heat transport is established and used to simulate the geothermal water flow in the karst aquifers in eastern Weibei, Shaanxi Province, China. The multilayered karst aquifer system in the study area is cut by some major faults which control the regional groundwater flow. In order to calibrate and simulate the effect of the major faults, each fault is discretized as a belt of elements with special hydrological parameters in the numerical model. The groundwater dating data are used to be integrated with the groundwater flow pattern and calibrate the model. Simulation results show that the calculated hydraulic heads and temperature fit with the observed data well. 相似文献
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Li Ming Li GuoMin Yang Liao Dang XueYa Zhao ChunHu Hou GuangCai Zhang MaoSheng 《中国科学:地球科学(英文版)》2007,50(1):36-41
The quantitative assessment of geothermal water resources is important to the exploitation and utilization of geothermal resources. In the geothermal water systems the density of groundwater changes with the temperature, therefore the variations in hydraulic heads and temperatures are very complicated. A three-dimensional density-dependent model coupling the groundwater flow and heat transport is established and used to simulate the geothermal water flow in the karst aquifers in eastern Weibei, Shaanxi Province, China. The multilayered karst aquifer system in the study area is cut by some major faults which control the regional groundwater flow. In order to calibrate and simulate the effect of the major faults, each fault is discretized as a belt of elements with special hydrological parameters in the numerical model. The groundwater dating data are used to be integrated with the groundwater flow pattern and calibrate the model. Simulation results show that the calculated hydraulic heads and temperature fit with the observed data well.
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扬子地区中-晚奥陶世转折期的碳同位素漂移事件及其成因探讨 总被引：1，自引：1，他引：0
中-晚奥陶世转折期的两次全球性碳同位素正漂--Middle Darriwilian Inorganic Carbon Excursion（MDICE）和Guttenberg Inorganic Carbon Excursion（GICE）--在发生时间上与生物辐射、全球大规模海侵和地球磁极的倒转等重大地质事件,以及海水锶、氧、硫同位素的显著变化相吻合,说明它们可能受相同形成机制的控制。在报道了扬子地区陈家河剖面中-晚奥陶世界线附近的这两次碳同位素正漂事件,并与塔里木盆地进行对比之后发现,扬子地区和塔里木盆地的MDICE和GICE与海水锶同位素比值的快速剧烈下降出现在同一层位,指示这两次碳同位素的正漂的形成可能和当时洋中脊热液活动的加剧有关。海底热液系统能够通过向海水中注入铁等生命必需元素,刺激海洋生物的繁盛,提高海洋的生产力和有机碳的埋藏,进一步引起了MDICE和GICE这两次碳同位素正漂。 相似文献
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基于潮间带和浅海12个柱状样粒度、地球化学元素、210Pb同位素实测数据,结合河流年代特征、岸线历史变化等资料,参照前人关于沉积相和沉积速率研究成果,对现代黄河三角洲南部潮间带及莱州湾西部海域沉积特征进行了分析。根据剩余210Pb比活度信息,综合运用历史地理学方法、沉积环境判别公式和粒度曲线变化特征,初步认识了现代黄河三角洲南部潮间带地区具体沉积年代。对柱状样的数据进行分析后,运用相关特征值定量区分了沉积物的物源。结果表明:在潮间带这样不稳定的沉积环境下,210Pbex比活度阶段性倒置的分布模式虽然无法对年代进行连续标定,但可以在很大程度上指示沉积环境变化。现代黄河三角洲南部潮间带沉积物形成时间要远早于莱州湾西部,210Pb结合沉积环境判别函数、历史地理资料以及粒度特征可以将深度102 cm、80 cm、32 cm分别标定为1929年、1934年和1947年。广利河水系在深度20 cm范围内影响沉积环境。地球化学元素相关特征值分析显示:现代黄河三角洲南部潮间带沉积物风化程度介于黄河和莱州湾南岸之间,个别微量元素富集程度与莱州湾沉积物差异明显,就沉积环境而言,与现代黄河沉积物已有所不同。 相似文献
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卫星激光测距（SLR）技术作为卫星精密定轨手段和轨道检核重要方法,激光反射器已经成为重力卫星和测高卫星等低轨卫星的基本载荷.经典的SLR台站坐标是使用动力学方法计算的,本文根据多颗低轨卫星（LEO）多历元的激光观测数据,采用几何方法开展地面SLR测站坐标计算.通过组建低轨卫星群实现对全球激光站的动态观测,为了合理配置不同低轨卫星间观测值权重,削弱低轨卫星群可能存在的系统性偏差,提出采用方差分量估计组合的最小二乘法进行解算.实测结果显示,解算出SLR台站坐标框架解与SLRF2014差异平均值在25.1 mm,外符合精度达到1~2 cm.该方法避免了复杂动力学模型,SLR台站坐标的几何计算方法既可以作为激光测站框架解算手段之一,同时将LEO卫星群作为空间并址站实现不同技术地球参考框架间的融合. 相似文献