A new Voronoi diagram-based approach for matching multi-scale road networks     

Wu  Jianhua  Zhao  Yu  Yu  Mengjuan  Zou  Xiaoxiang  Xiong  Jiaqi  Hu  Xiang 《Journal of Geographical Systems》2023,25(2):265-289

Journal of Geographical Systems - Object matching is a key technology for map conflation, data updating, and data quality assessment. This article proposed a new Voronoi diagram-based approach for...  相似文献   

禹城市城区东营组热储地热资源赋存特征研究          下载免费PDF全文

王浩  张震宇  杨建华 《山东国土资源》2014,30(1):33-36

山东省禹城市城区在大地构造上属于华北陆块、华北拗陷区、济阳坳陷区、惠民潜断陷、临邑凹陷南部。通过已有钻探资料及近年的勘查项目研究成果,对禹城市城区东营组热储的地热资源的地质背景、水文地质特征、地热流体化学特征等进行了综合研究分析,认为禹城市城区东营组热储属于层控型低温地热田,地下热水矿化度较大,成因主要为大气降水。  相似文献   

荒漠河岸胡杨(Populus euphratica)树干液流的时滞效应   总被引：1，自引：0，他引：1  

赵春彦  司建华  冯起  常宗强  鱼腾飞  李炜 《中国沙漠》2014,34(5):1254-1260

以2012年4—9月树干液流速率与环境因子的实测数据,分析了荒漠河岸胡杨(Populus euphratica)树干液流的时滞效应。结果表明:不同月份胡杨树干液流速率对不同环境因子的时滞不同;4—9月,胡杨树干液流速率峰值时间比太阳辐射峰值时间晚约1h,比空气温度峰值时间早约1h,比水汽压差峰值时间早约2h,比空气相对湿度谷值时间早约2h;对影响胡杨树干液流速率的环境因子进行了主成分分析,发现胡杨树干液流速率与1h以前的第1主成分、第2主成分相关性最高,相关系数分别为0.864、0.875;对错位前后胡杨树干液流速率与环境因子进行多元线性回归分析发现,在胡杨树干液流的数值模拟中,考虑液流相对于环境因子的时滞效应可以提高模型的拟合精度。  相似文献   

近百年中国东部夏季降水年代际变化特征及其原因   总被引：15，自引：4，他引：11  

吕俊梅  祝从文  琚建华  林祥 《大气科学》2014,38(4):782-794

本文利用测站降水观测资料分析过去一百多年中国东部华北、长江流域以及华南夏季降水的年代际变化特征发现,尽管这三个地区的夏季降水具有不同的年代际转折时期,但是均同时在1910年代初期、1920年代初期、1940年代中期、1960年代中期、1970年代末期以及1990年代初期发生了跃变。近一百年间不同年代际时期东部夏季降水的分布型主要以南正北负或者南负北正的偶极型为主,并且无论是偶极型分布还是三极型分布,两个相邻年代际时期中国东部降水分布型发生完全反向变化的概率较高（60%）。此外,夏季的PDO、冬季的AO以及春季的北极海冰也同时在1920年代末期、1940年代中期、1970年代末期以及1990年代中期左右发生了跃变,这几次跃变时期与中国东部三个不同地区夏季降水发生跃变的时期一致,表现出近百年来太平洋年代振荡（PDO）、北极涛动（AO）以及北极海冰这三个因子对中国东部夏季降水年代际变化的协同作用。在年代际时间尺度上,夏季的PDO与华北夏季降水显著负相关。PDO的年代际变化能够在500 hPa位势高度场中激发出太平洋—日本（PJ）型年代际遥相关波列;同时在850 hPa风场中激发出类似于影响华北夏季降水年代际变化的大气环流型,从而影响华北降水的年代际变化。冬半年的AO与长江流域夏季降水存在显著正相关关系。冬季到春季正位相的AO导致亚洲大陆南部处于湿冷状态,土壤湿度的记忆性可将这种状态延续到夏季。因此,夏季海陆热力对比减弱,东亚夏季风发生年代际减弱,相应地长江流域的降水年代际增多。春季北极海冰与华南夏季降水显著负相关,北极海冰的年代际异常能在500 hPa位势高度场中激发出与静止Rossby波异常传播相联系的欧亚—华南年代际遥相关波列,从而影响华南降水的年代际变化。  相似文献   

利用生产动态及地震资料分析井间河流相砂体连通性     

王海更  汪利兵  刘洪杰  刘建华  刘卫林  申春生 《海洋地质译丛》2014,(3):66-71

渤海PL油田是位于渤海湾盆地的大型河流相油田,在其注水开发过程中,亟需准确认识注水井与生产井之间的砂体连通性,以便优化和调整注采井网,提高采收率.针对油田砂体横向变化快,纵向上薄砂体发育的特点,利用丰富的压力、水淹等生产动态资料及相位转换后赋予地质意义的地震资料综合分析砂体的连通性,进一步完善和修正了早期以地质及测井资料确定的砂体连通性分析成果,并引入注采连通率概念,用来定量表示井组范围内注水井与生产井之间的砂体的连通性.该套方法在PL油田注水优化及井网调整研究中得到了充分的体现,对其它河流相注水开发油田井组范围内井间砂体连通性研究具有一定的借鉴作用.  相似文献   

基于微孔充填模型的页岩储层吸附动力学特征分析   总被引：1，自引：0，他引：1       下载免费PDF全文

尹帅  丁文龙  刘建军  何建华  王濡岳  李昂  王莹莹 《高校地质学报》2014,20(4):635

微孔填充是吸附质分子在吸附剂纳微孔隙中、较高平衡压力下表现出来的一种吸附特征,以此为基础发展起来的热
力学理论在确定吸附剂微观结构及吸附性能研究方面起到了巨大推动作用。基于此,该文重点探讨了甲烷在页岩中吸附时
填充率θ、特征能量E、特征系数n、微分吸附功A 、吸附热Q、吸附焓ΔH 及吸附熵ΔS 的变化关系。结果表明：特征系数n
取1较为适当;温度升高特征能量E 值略降,3组样品E 值范围4.14~5.63 kJ/mol;随着θ 的不断增加,A ,Q ,｜ΔH ｜及｜
ΔS ｜等参数值逐渐降低,各能量参数随吸附进行而发生较为规律的变化,无突变。结果认为,热力学参数一定程度上代表
了TOC 及Ro 等参数的综合效应,受单一因素干扰性不强。将计算的Q 及ΔS 等热力学参数与四川盆地志留系龙马溪组页岩的
相应参数进行了对比,进一步表明四川盆地该套龙马溪组页岩具有巨大的页岩气勘探和开发潜力。  相似文献   

Determining the optimal pumping duration of transient pumping tests for estimating hydraulic properties of leaky aquifers using global curve-fitting method: a simulation approach   总被引：1，自引：1，他引：0  

Peiyue Li  Hui Qian  Jianhua Wu  Hongwei Liu  Xinsheng Lyu  Hongbo Zhang 《Environmental Earth Sciences》2014,71(1):293-299

Global curve-fitting method (GCFM) is regarded as an effective approach in hydrogeological parameter estimation, as it integrates and uses pumping data and water recovery data of a transient pumping test for parameter estimation. The impacts of pumping duration on hydrogeological parameter estimation by GCFM were investigated in the present study using 2 in situ pumping tests and 24 simulated transient pumping tests. Empirical formulas for determining the optimal pumping duration were derived. The study results suggest that pumping duration will have impacts on the accuracy of hydrogeological parameter estimation. When pumping duration is longer than a certain period, relative errors of hydrogeological parameter estimation keep relatively stable within an acceptable limit. Therefore, it is unnecessary to continue the pumping for a very long time after the groundwater level has become stable. When the change rate of drawdown over time (γ) in an observation well located within a distance of 100 m to the pumping well reaches 0.134, the pumping can be stopped. If there are more than one observation wells in a pumping test, the smallest γ value should be selected to determine the optimal pumping duration. This research is meaningful in the instruction of pumping tests, and will reduce test costs greatly.  相似文献   

Assessment of soil salinization based on a low-cost method and its influencing factors in a semi-arid agricultural area,northwest China   总被引：13，自引：9，他引：4  

Jianhua Wu  Peiyue Li  Hui Qian  Yuan Fang 《Environmental Earth Sciences》2014,71(8):3465-3475

An investigation of soil salinization was carried out in the Nanshantaizi area (Northwest China) with WET Sensor. This device can measure such soil parameters as bulk soil electrical conductivity, water content, and the pore water electrical conductivity that are important for soil salinization assessments. A distribution map of soil salinization was produced, and the factors influencing soil salinization and its processes were discussed in detail. The study shows that moderately salinized to salt soils are mainly observed in the alluvial plain, where groundwater level is high and lateral recharge water contains high salinity. Nanshantaizi is covered by slightly salinized soils. The soil salinization distribution estimated by WET Sensor is generally consistent with the actual levels of salinization. Soil salinity in Nanshantaizi is mostly of natural origin and accumulated salts could leach to deeper soils or aquifers by water percolation during irrigation. Groundwater evaporation, groundwater level depth and quality of recharge water are important factors influencing soil salinization in the alluvial plain.  相似文献   

Comparison of Blast-Induced Damage Between Presplit and Smooth Blasting of High Rock Slope     

Yingguo Hu  Wenbo Lu  Ming Chen  Peng Yan  Jianhua Yang 《Rock Mechanics and Rock Engineering》2014,47(4):1307-1320

This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS-DYNA. The results demonstrate that, in the case of contour blasting with the method of smooth blasting, the total damage of rock slope is a result of cumulated damage induced by the production hole, buffering hole, and smooth hole. Among the total damage, the blasting of the production hole is the main resource, followed by the smooth and buffering holes. For the presplit blasting, the final damage of rock slope is mainly induced by presplit blasting itself. The spatial distribution characteristics of the final damage zone of two methods are compared. Two classes of damage zone could be found in smooth blasting excavation; one of them is the columnar high-degree damage zone around the slope surface and the other is the low-degree damage zone located in the middle of the slope. But in the case of presplit blasting, there is only the columnar high-degree damage zone around the slope surface. Finally, a damage control suggestion for two blasting excavation methods is proposed and verified based on the excavation of the temporary shiplock slopes of the Three Gorges Project in China.  相似文献   

基于3G与3S集成的土地利用执法检查应用     

董廷旭  王建华  陈朝镇  张新合 《地球信息科学学报》2011,13(2):260-265

土地卫片执法检查是政府实施土地严格管理的重要手段.本文以绵阳市2009年度遥感土地执法检查为例,选用2008年和2009年两个时相的中巴资源卫星02B遥感图像作为信息源,对3G与3S集成技术在土地利用执法检查中应用方法进行了研究.该方法利用RS获取土地利用变化信息,利用VRS-GPS技术采集变化图斑空间与属性特征信息,...  相似文献