总辐射与地表净辐射相关性的气候学研究   总被引：3，自引：1，他引：3  

翁笃鸣  高庆先 《南京气象学院学报》1993,16(3):288-294

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应用航空摄影资料编制高山峡谷地区正射影像图     

钱育华  翁祖平  许楷成 《遥感学报》1993,(1)

本文阐述了利用既有比例尺为1:4.5万和1:3.5万的航摄像片及1:5万成图的航测外业控制成果,经内业空中三角测量加密定向点,采用解析测图-正射投影系统,编制成318幅1:1万高山峡谷地区的正射影像图的技术。经过检查,成图质量达到了技术设计标准,满足土地资源调查制图精度要求。  相似文献   

高分辨率浅层地震勘探在探测隐伏断层中的应用   总被引：1，自引：0，他引：1  

李金森  王恩福  张正墨  杨仕春 《东北地震研究》1994,(4)

通过对河北省滦南县２２万伏变电站厂址隐伏断层的探测，给出了采用高分辨率浅层地震勘探探测活动断裂的观测与解释方法，并给出了在县城南存在一规模较大的一组从第四纪Ｑ＿２地层一直断至太古界基底。它从属宁河—昌黎断裂的分支系列。断层附近存在第四纪隐伏玄武岩。  相似文献   

Connection between earthquakes and deep fluids revealed by magnetotelluric imaging in Songyuan,China     

Yu TANG  Aihua WENG  Yue YANG  Shiwen LI  Jianjun NIU  Yanhui ZHANG  Yabin LI  Jianping LI 《中国科学:地球科学(英文版)》2021,64(1):161-176

Songyuan is the most earthquake prone area in northeast China.Since 2006,earthquakes have occurred in the area in the form of swarms,with a maximum magnitude of M_L5.8.There is much controversy about the cause of the Songyuan earthquakes.We attempted to determine the cause using a three-dimensional electrical conductivity structure inverted from a regional network of magnetotelluric data in the Songyuan area.The L-BFGS inversion method was applied,with a fullimpedance tensor data set used as the inversion input.Combined with an evaluation of the earthquake locations,the resistivity model revealed a northeast-oriented hidden fault running through the Songyuan earthquake area(SEA),which was speculated to be the preexisting Fuyu-Zhaodong Fault(FZF).Our resistivity model also found an apparent lithospheric low-resistivity anomaly beneath the earthquake area,which breached the high-resistivity lithospheric mantle and stalled at the base of the crust.A petrophysical analysis showed that this lower crustal low-resistivity anomaly was most likely attributed to hydrated partial melting,which could release water into the lower crust during later magma emplacements.While weakening the strength of the FZF,these ascending fluids also increased the pore pressure in the fault,further reducing the shear strength of the fault.Shear stress action(a fault strike component of the east-west regional compress),together with possible near-surface disturbances,may drive the fault to slip and trigger the earthquakes in Songyuan.It is possible that the continuous replenishment of fluids from the deeper mantle forces the Songyuan earthquakes into the form of swarms.We infer that the Songyuan earthquakes could be attributed to a combination of preexisting faults,regional stress,and deep fluids associated with plate subduction,and near surface disturbances might induce the earthquakes in advance.The Songyuan earthquakes are inherently induced earthquakes,fed by deep fluids.  相似文献   

强降水过程风廓线雷达资料的极值特征     

陈红玉  高月忠  尹丽云  钟爱华  董保举 《气象科技》2016,44(1):87-94

为提高强降水天气的短临预报水平,分析了云南大理2008—2012年汛期地面强降水发生前风廓线雷达资料的极值特征。结果表明:强降水前0~1h最大探测高度最高,强降水的强度与最大探测高度的量值和增幅呈正相关。强降水出现前1h左右,向下的垂直速度极值最大,所对应的高度最低;且向下的垂直速度极值越大,强降水的强度也越大。在强降雨发生前1h出现信噪比极值的峰值,该峰值越大,强降水的强度也越大。较强的强降水发生前3~4h,在4.0km高度附近有中尺度急流出现。  相似文献   

黄山雨滴下落过程滴谱变化特征   总被引：2，自引：2，他引：0       下载免费PDF全文

袁野  朱士超  李爱华 《应用气象学报》2016,27(6):734-740

利用2011—2012年4—10月安徽省黄山山顶和山底两个站点同时采集的雨滴谱数据,共选取17个降水个例,将17个降水个例分为对流云降水和层云降水,对不同高度和不同云系降水雨滴谱特征分析得出以下结论:对于不同云系的降水,山顶平均雨滴数浓度大于山底,平均峰值直径和平均质量半数直径在下落过程中均增加,平均雨强和平均雷达反射率因子变化幅度较小。不同云系的雨滴在下落过程中,雨滴谱谱宽变化较小,但雨滴谱均从M-P (Marshall-Palmer) 分布转向了Gamma分布。降水粒子在下落过程中,大部分通道的数浓度均出现损失,最大损失超过50%,随着粒子尺度增加损失逐渐减少,大粒子数浓度在降落时有所增加,增加幅度为10%左右,降水粒子的碰并和蒸发过程很可能是造成降水粒子下落过程中滴谱变化的两个主要原因。  相似文献   

基于面板数据的旅游经济效应空间分异及优化研究——以山东省为例     

周霓  熊爱华 《地理科学》2016,36(2):289-295

依据2000~2012年山东省17个地市的GDP和旅游总收入数据,构建面板数据模型,用定量的方法测度山东省17个地市的旅游业发展和经济增长之间是否存在长期协整关系,并对存在协整关系的地市进一步进行Granger因果检验和面板数据模型回归分析。结果表明: ① 山东省东中西三大地域板块旅游经济效应空间分异现象明显,东部地区的旅游总收入已经成为了经济增长的Granger因,旅游业发展已经对经济增长起到了良好的推动作用,青岛和烟台的旅游总收入和经济增长已经存在双向Granger因果关系;② 中部地区的经济增长是旅游总收入增长的Granger因,经济增长对旅游业发展起到了保障和助推的双重作用,特别是东营和枣庄已经成为山东省旅游业发展的新亮点;③ 西部地区的经济增长和旅游总收入之间尚未形成协整关系。根据研究结果,给出山东省旅游业均衡、健康发展的建议和对策。  相似文献   

鄂尔多斯盆地宁县-合水地区长6、长7、长8储层裂缝差异性及开发意义   总被引：2，自引：0，他引：2       下载免费PDF全文

赵向原  曾联波  王晓东  王菲  张阳禹  焦军  翁剑桥 《地质科学》2015,(1):274-285

根据露头、岩心及测井等资料,对比研究了宁县—合水地区长6、长7、长8储层裂缝发育特征的差异性,并讨论其开发意义。宁县—合水地区长6、长7、长8储层均发育构造裂缝和成岩裂缝两种成因类型,但各储层的裂缝产状、裂缝规模(纵向高度及平面长度)及裂缝发育程度存在较大差别。长6储层主要发育近东西向和近南北向两组裂缝,长7储层北东东—南西西向裂缝最为发育,其次为近东西向和近南北向,长8储层北东东—南西西向裂缝最为发育,其次为近东西向裂缝和北西西—南东东向;各储层均以发育高角度构造裂缝为主,但长6储层还发育一定数量中低角度泥岩滑脱裂缝,比例相对较大;在裂缝规模和裂缝发育程度上,长7储层裂缝最为发育,规模相对较小,长8储层裂缝发育程度最差,但具有较大的裂缝规模,长6储层裂缝发育程度和规模介于以上两者之间。由于长6、长7、长8储层裂缝发育特征的差异性,在现今地应力场作用下不同层位、不同产状裂缝开启能力会存在差异,因此在进行注水开发时,要根据各储层裂缝的发育情况,准确计算不同层位裂缝开启压力值,进而确定合理的注水参数,避免注水压力过大造成裂缝大规模开启。此外,通过计算长6、长7、长8储层脆性指数可知,长7储层脆性相对较大,且天然裂缝最为发育,适合采取体积压裂进行储层改造。  相似文献   

Effects of drought stress on agriculture soil     

Geng  S. M.  Yan  D. H.  Zhang  T. X.  Weng  B. S.  Zhang  Z. B.  Qin  T. L. 《Natural Hazards》2015,75(2):1997-2011

Natural Hazards - Droughts often affect the soil ecosystem directly. To address this question, a series of prototype observation experiments were designed in this study. The objective of this study...  相似文献   

Coupled mobilization of dissolved organic matter and metals (Cu and Zn) in soil columns   总被引：2，自引：0，他引：2  

Lu Y.L. Zhao  Liping Weng 《Geochimica et cosmochimica acta》2007,71(14):3407-3418

Dissolved organic carbon (DOC) is a key component involved in metal displacement in soils. In this study, we investigated the concentration profiles of soil-borne DOC, Cu and Zn at various irrigation rates with synthetic rain water under quasi steady-state conditions, using repacked soil columns with a metal-polluted topsoil and two unpolluted subsoils. Soil solution was collected using suction cups installed at centimeter intervals over depth. In the topsoil the concentrations of DOC, dissolved metals (Zn and Cu), major cations (Ca²⁺ and Mg²⁺) and anions ( and ) increased with depth. In the subsoil, the Cu and Zn concentrations dropped to background levels within 2 cm. All compounds were much faster mobilized in the first 4 cm than in the rest of the topsoil. DOC and Cu concentrations were higher at higher flow rates for a given depth, whereas the concentrations of the other ions decreased with increasing flow rate. The decomposition of soil organic matter resulted in the formation of DOC, , and and was the main driver of the system. Regression analysis indicated that Cu mobilization was governed by DOC, whereas Zn mobilization was primarily determined by Ca and to a lesser extent by DOC. Labile Zn and Cu²⁺ concentrations were well predicted by the NICA-Donnan model. The results highlight the value of high-resolution in-situ measurements of DOC and metal mobilization in soil profiles.  相似文献