矩形基坑涌水量计算方法研究     

旷南树  张建军  曹文文 《岩土工程技术》2013,(5):230-233

通过对矩形基坑渗流模型的理论研究及实践分析,以达西定律及裘布依假定为理论依据,推导了潜水完整矩形基坑涌水量的计算方法。并通过工程实例,分析了本文计算方法、大井法、瀑布法适用的基坑涌水量计算类型,认为本文计算方法更适合于长宽比较大时矩形基坑涌水量的计算。  相似文献   

Modelling real earthquake activity with reverse engineering based on evolutionary computation methods     

《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2013,7(4):275-288

Hazard assessment of dangerous natural phenomena is critical because of their evident results concerning loss of human life and property, especially in dense populated areas. Earthquakes are probably the most devastating phenomenon since their immediate and long-term consequences are severe. This study is focused on the earthquake data analysis in different regions of Greece, characterised by different seismicity levels. In specific, a novel model is proposed based on evolutionary computation methods, such as symbolic regression by genetic programming and genetic algorithms in order to elucidate preliminary hidden mathematical relations and patterns found in the seismological signals under study. Furthermore, the model is calibrated using reverse engineering and closes the loop from the data collection to initial hypothesis. In this way, the model formation is achieved. The presented simulation results qualitatively and quantitatively reveal some of the fundamental characteristics of each studied geographical region located in Greece that stem from its geodynamic properties.  相似文献   

基于气候重建资料及均生函数-最优子集回归模型的降水预测   总被引：1，自引：0，他引：1       下载免费PDF全文

马龙  刘廷玺  冀鸿兰  高瑞忠 《水文》2013,33(1):63-67

利用由科尔沁沙地榆树区域综合年表而重建的181a降水序列,采用均生函数-最优子集回归(MGF-OSR)预测模型对科尔沁沙地降水进行了5a情景的预测,克服了以往序列短的不足.模型建模期相对误差绝对值在3％、5％、10％以内的年数分别占建模年数的36.46％、64.64％、93.37％,建模期模拟精度较高.2007～2010年实测检验期,模拟与实测值保持了方向一致性,各年份相对误差绝对值分别为11.40％、6.73％、22.06％、5.49％,大部分年份预测较理想.经预测,2011～2015年期间,2011年、2012年、2014年和2015年为降水正常年份,2013年为降水偏干年份.与实际情况对比,2011年与预测一致,2012年稍有差别.总体上,2011～2015年降水变化较为平缓.  相似文献   

建立磁化率快速预测白马钒钛磁铁矿含量模型     

邓波  邱杰  赵顺林 《四川地质学报》2013,(3):349-352

根据白马钒钛磁铁矿区试验钻孔井壁岩矿石磁化率与钒钛磁铁矿含量的关系,矿区岩矿石磁化率与钒钛磁铁矿含量的相关性,建立了磁化率与钒钛磁铁矿含量的回归方程。通过此方程的应用可以快速判断井壁岩矿体的钒钛磁铁矿含量,指导采样布设。  相似文献   

基于MLS的FLAC3D复杂三维地质建模     

李国庆  汪新庆  尹改梅 《地质力学学报》2013,19(3):334-342

针对岩土力学分析软件FLAC3D建模效率较低的不足之处,在分析FLAC3D建模命令以及网格模型＊.FLAC3D文件格式特点的基础上,介绍了空间坐标变换、MLS插值的方法与意义,并提出了新的建模方法,开发了相应的计算机辅助建模程序.该程序直接读取原始数据点,无需借助第三方软件,通过坐标变换、MLS插值,可快速生成具有复杂边界的地质模型,且便于材料参数和应力边界条件参数的赋值,可有效地提高工作效率.  相似文献   

用于ENSO预测的一种广义典型混合回归模式及其预报试验   总被引：6，自引：0，他引：6  

江志红  丁裕国  周琴芳 《热带气象学报》1999,15(4):322-329

提出一种基于主分量典型相关分析（ＰＣ－ＣＣＡ）的广义典型混合回归模式，用于建立ＮＩＮＯ海区ＳＳＴ预报方案．该模式引入ＥＥＯＦ、ＰＲＥＳＳ准则和集成预报等技术思想，在优选物理因子，确定最佳模式参数的基础上，对ＮＩＮＯ海区海温指数所作的超前１—４季度预报试验取得优良效果．试验表明，该模式方案性能稳定，其总体预报技术水平已达到美国ＮＯＡＡ／ＮＷＳ／ＮＣＥＰ／气候诊断公报（ＣＰＣ）所用同类模式水平．而本模式方案预报同类产品所需因子数远少于ＣＰＣ方法。这就有可能为建立我国的ＥＮＳＯ业务监测系统提供有益的基础。  相似文献   

广州市空气污染的变化特征及预报   总被引：7，自引：5，他引：7  

纪忠萍  罗森波  邝建新  罗秋红  陈敏升  梁桂雄 《热带气象学报》2006,22(6):574-581

利用2002年11月-2004年9月广州市空气污染指数（API）和PM10、NO2、SO2等污染物逐日浓度资料，采用小波分析、相关分析等方法对广州市空气污染的变化特征及与同期地面气象要素的关系进行了分析。并采用最优子集回归方法分别建立冬、夏季API指数及污染物浓度的预报方程。结果表明。PM10是广州市的主要污染物。其次为NO2、SO2。除SO2外，广州市API指数、NO2、PM10等污染物浓度具有冬半年（11-4月）偏高，夏半年（5-10月）偏低的变化规律。API指数及各种污染物浓度均具有明显的年周期振荡及5-7天的准单周、10-20天准双周、30-60天左右的季节内振荡，且30-60天的季节内振荡在冬半年较强而在夏半年较弱。冬半年API指数和PM10、NO2、SO2浓度与气压、风速、降水呈稳定负相关，与温度、相对湿度等呈稳定的正相关，而夏半年主要与风速、降水具有较好且稳定的负相关。增加前一天的污染物浓度作为预报因子后，所建的最优子集回归方程比单选用气象因子要稳定。具有较强的预测能力。  相似文献   

Spatial evolution and growth mechanism of urban networks in western China: A multi-scale perspective     

Yang  Liangjie  Wang  Jing  Yang  Yongchun 《地理学报(英文版)》2022,32(3):517-536

Journal of Geographical Sciences - Globalization and informatization promote the evolution of urban spatial organization from a hierarchical structure mode to a network structure mode, forming a...  相似文献   

Traffic accessibility and the coupling degree of ecosystem services supply and demand in the middle reaches of the Yangtze River urban agglomeration,China     

Chen  Wanxu  Bian  Jiaojiao  Liang  Jiale  Pan  Sipei  Zeng  Yuanyuan 《地理学报(英文版)》2022,32(8):1471-1492

Journal of Geographical Sciences - The spatial relationships between traffic accessibility and supply and demand (S&D) of ecosystem services (ESs) are essential for the formulation of...  相似文献   

Spatio-temporal Analysis of Changes in Winter Wheat Cold Damage with Meteorological Elements in Huang-Huai-Hai Plain from 2011 to 2020     

ZHENG Xintong  XIE Chuanjie  HE Wei  LIU Gaohuan 《资源与生态学报(英文版)》2022,13(2):196-209

The Huang-Huai-Hai Plain is one of the typical agri-ecosystems in China, which suffers from cold damage frequently resulting in substantial economic losses. In order to monitor the changes in the occurrence of cold damage in an effective and large-scale manner, and to determine their meteorological causes, this paper collected low temperature data from the agricultural meteorological stations and remote sensing data of MODIS from 2005 to 2015, and constructed a monitoring model of cold damage to winter wheat in Huang-Huai-Hai Plain based on the Logistic regression model. This model was used to analyze the spatio-temporal changes of cold damage of winter wheat in Huang-Huai-Hai Plain from 2011 to 2020, and correlation analysis was performed with the spatio-temporal changes of meteorological factors to ascertain how they affect cold damage. The results show that the harm from cold damage in winter wheat has been gradually decreasing from 2011 to 2020, and the cold damage areas with high probability and high frequency are moving from north to south. The meteorological elements with the greatest impacts on the degree of cold damage from stronger to weaker are heat, precipitation and sunshine duration, whose influence has spatial variability.  相似文献