How complex can a land suitability map be?     

Y. Diao 《International journal of geographical information science》2013,27(7):747-755

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Consistent Distribution of Stress before Strong Earthquake from Focal Mechanisms     

Zeren Zhim  Diao Guiling  Li Zhixiong 《中国地震研究》2010,24(4):415-422

At some stage of a strong earthquake preparation,the focal mechanisms of small earthquakes have roughly the same direction with the tectonic stress field.According to this feature,we define the angle between P,B and T axis of focal mechanisms and the three stress axes of tectonic stress field as the consistency parameter a in studying the dynamic changes of stress fields in earthquake preparation areas.We mainly analyze the changes of the consistency parameter a of the MW8.3 Kuril island arc earthquake and the MW8.4 Peru earthquake.Our study shows that before the strong earthquakes,the earthquake area saw a low consistency,and the focal mechanisms of a series of small earthquakes had small differences in the directions with the tectonic stress field,which means the foreshocks were under the control of the stress field.On the other hand,a higher consistency means the focal mechanisms of their aftershocks are scattered and have big differences in the directions with the tectonic field,which indicate that the control of background stress field starts weakening.  相似文献   

Fault plane parameters of Tancheng M81/2 earthquake on the basis of present-day seismological data     

Cuiying Zhou  Guiling Diao  Jie Geng  Yonghong Li  Ping Xu  Xinliang Hu  Xiangdong Feng 《地震学报(英文版)》2010,(6):567-576

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Removal of Lead and Zinc From Contaminated Soil by a Novel Chelating Surfactant          下载免费PDF全文

Hong‐tao Qiao  Bao‐wei Zhao  Jing‐ru Diao  Li‐ping Huang  Jin‐kui Zhong  Feng‐feng Ma 《洁净——土壤、空气、水》2016,44(9):1191-1197

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哈尼梯田麻栗寨河流域泉水氢氧同位素的海拔效应     

刘澄静  角媛梅  张贵玲  刘歆  章天应 《冰川冻土》2016,38(5):1404-1410

氢氧同位素是示踪流域水循环过程的有效方法,水是维系哈尼梯田景观稳定性的关键.以哈尼梯田文化景观遗产核心区的麻栗寨河流域泉水为研究对象,通过采集不同海拔的33个样品分析泉水氢氧同位素的海拔效应.结果表明：总体上看,泉水氢氧同位素随海拔的上升而下降,其递减率随海拔增加而变大,并具有高、中、低三段海拔分异的特征;低海拔段（1 060 m以下）和高海拔段（1 510 m以上）均具有明显的海拔效应,但中海拔段（1 060~1 510 m）相关关系不显著;泉水氢氧同位素关系方程与全国大气降水线相比斜率略小,说明在泉水形成之前曾受雨量效应、蒸发作用和补给等因素影响;在氘盈余方面,低海拔段的d值与全国大气降水线相当,中海拔段明显低于全国大气降水线,高海拔段明显高于全国大气降水线,说明研究区泉水存在强烈的混合作用,且其海拔效应是在补给水源多次循环和利用过程中形成.  相似文献   

从汶川和日本巨震浅论我国地震预测的可应用性问题     

程万正  刁桂苓 《国际地震动态》2012,(10):23-29

本文从2008年中国汶川、2011年日本东北部巨震出发,论述我国地震预测,尤其是对应用实践中涉及的技术问题和需要重视的管理问题。  相似文献   

历史有感地震目录编制原则方法的研究——以《中国历史有感地震目录》编制为例     

刁守中  晁洪太  孙厥祥  李霞  山长仑  刁颋 《国际地震动态》2012,(4):30-38

在吸收历史地震研究、历史政区地理研究等多方面成果基础上,基于历史有感地震记载特点,探索了历史有感地震目录的编制原则,给出了地震日期、震中位置、震级的确定方法。以《中国地震历史资料汇编》等为依据,编制了公元前618年-公元1949年期间中国境内3≤M<443/4级历史有感地震目录9 121条。目录数量为中国同期文字记载的43/4级以上破坏性地震的7倍多,比全球其他国家或地区最早的同类目录早1 695年,约占全球同期M≤4.5级有感地震目录的2/3。  相似文献   

Study on Movement Evolution Law of Soil Water in Condition of Agronomic Water Saving Irrigation          下载免费PDF全文

Guiling Wang  Wenjing Lin  Wei Zhang  Qi Fan  Qinghua Wu 《地下水科学与工程》2013,1(1):33-45

Fresh water supplied are often limited in mainland China, reducing agricultural productivity. However the use of straw mulch is the main management technique for agronomic water saving. This paper investigates the movement of soil water under straw mulch compared to a non-mulch test plot. Results demonstrated that straw mulch effected soil water movement primarily during drought periods and throughout shallow soil (i.e. depths of less than 200 cm). The soil moisture and soil water potential at the mulch test plot in drought period are both higher than that of contrast test plot, and along with increasing soil depth, the straw mulch effect weakens. When evaporation is dominated by surface evaporation, straw mulch will effectively restrict the evaporation of soil water; when evaporation dominated by vegetation transpiration, the straw mulch promotes the transpiration of vegetation. In drought periods, straw mulch is not effective for deep soil water infiltration, but is advantageous for soil water utilization of mid- and shallow- soils (0-120 cm), however the infiltration speed rate of straw mulch point during high water period is higher than that of contrast plot. This paper highlights the importance of good management practices of agricultural land in order to limit soil water losses, which is essential when water is such a limited resource.  相似文献   

中国二氧化碳地质储存目标靶区筛选技术方法     

贾小丰  张杨  张徽  刁玉杰  李旭峰  范基姣  张超  郑长远 《吉林大学学报(地球科学版)》2014,44(4):1314

在沉积盆地三级构造单元CO₂地质储存潜力与适宜性评价得出的“适宜CO₂地质储存”区域的基础上,借鉴国外已有的选址流程和方法,结合我国的地质条件和技术方法水平,提出了深部咸水层CO₂地质储存目标靶区筛选评价指标体系,包括安全性、储存规模、场地地面环境条件和经济适宜性四大评价指标层以及44个具体评价指标,并将层次分析法和多因子逐层叠加法等评价方法应用于目标靶区筛选。通过鄂尔多斯盆地和河套盆地3处典型目标靶区适宜性评价的实例,证明了该评价指标体系在目标靶区筛选过程中具有较好的可操作性和推广应用价值。  相似文献   

移动测量平台在线对准方法研究   总被引：1，自引：1，他引：0  

张亚男  张震  赵桂玲  朱红 《测绘通报》2015,(8):4-8

针对移动测量平台难以进行有效机动并受恶劣环境的影响阻碍惯性导航系统在线对准速度和精度提高的难题,提出了一种基于EKF-KF混合动态滤波的移动测量平台在线对准方法。将系统误差方程中的水平失准角和大方位失准角进行分离,采用扩展卡尔曼滤波(EKF)对大方位失准角进行估计,采用Kalman滤波(KF)对水平失准角进行估计,并将方位失准角的估计误差对水平失准角的估计进行修正。仿真结果表明,EKF-KF混合动态滤波缩短了移动测量平台在线对准的估计时间,提高了失准角的估计精度。  相似文献