不同方法计算的气温平均值差异分析   总被引：6，自引：3，他引：6       下载免费PDF全文

刘小宁张洪政  李庆祥 《应用气象学报》2005,16(3):345-356

利用1961～2002年699个国家基本（基准）站的时值气温观测资料，分析了我国不同方法计算的气温平均值的差异。结果表明:平均气温计算值由于受4次观测、3次观测不同的计算方法的影响，造成4次、3次观测记录平均值产生一定差异。其差异在空间分布中具有明显的特征，西部、北部地区3次平均值偏高；东南部地区3次平均值偏低。中西部地区4次、3次气温平均值的差异具有扩大的趋势，是由于最低气温的升高引起的。因此，在使用气温平均值时，要充分重视平均气温值的计算方法，避免误差。  相似文献   

遥感资料在SCS模型产流计算中的应用   总被引：1，自引：0，他引：1  

魏文秋  谢淑琴 《遥感学报》1992,(4)

SCS模型在降雨径流关系上,考虑了土壤类型、土地利用和前期土壤含水量状况,使产流计算建立在较合理的基础上。但由于反映上述因素的综合指标CN的地区性、前期土壤含水量分级太粗、土壤分类的不通用性等,在我国直接应用误差太大。本文分析了误差太大的原因,提出了对SCS模型产流计算的改进方法;并采用土壤质地分类,提出用混合聚类法进行土壤分类。改进后的SCS模型产流计算不仅提高了精度,还可用来进行降雨径流预报。  相似文献   

探矿者软件Minexplorer的框架结构及技术流程   总被引：1，自引：0，他引：1       下载免费PDF全文

范建福  肖克炎  张婷婷 《江苏地质》2012,36(3):313-315

探矿者软件Minexplorer是通过对地质统计学理论和三维地质建模技术的研究,结合我国地质勘查实际情况而开发的综合性三维地质勘查系统.介绍了探矿者软件Minexplorer的框架结构及技术流程.  相似文献   

龙东公路④号滑坡稳定性评价及滑坡推力计算     

董学山 《云南地质》2012,(3):374-378,339

滑坡位于斜坡中部,面积大、临空面宽,玄武岩碎石土分布广,近期活动明显。经69个钻孔及地表调绘实测,完成稳定性评价及推力计算,有效提供治理依据。  相似文献   

An Overview of Measurement and Calculation Methods on the Land Surface Temperature on Alpine Mountainous Cold Regions     

Yang Yong  Chen Rensheng  Song Yaoxuan 《地球科学进展》2014,29(12):1383-1393

Land surface temperature on alpine mountainous cold regions, which is one of basic parameters of the regional hydrological and meteorological conditions, directly affects glacial recession, snow melt, distribution and freezing thawing process of permafrost, evapotranspiration, vegetation growth, and various underlying surface change process, and then changes the regional hydrological and ecological environment, becomes the important parameter of the research on land surface process and the study of eco-hydrological process. This paper tried to provide an overview of research on land surface temperature, and to introduce its influence factors and the ways to obtain land surface temperature data in high mountainous cold region. Relative to low elevation plain, the land surface temperature was significantly affected by local altitude, terrain and plant cover. There were some methods to obtain land surface temperature, such as measurement in situ, retrieval based on remote sensing and calculation by land surface process models, but there were some limitations while used on alpine mountainous cold regions. Land surface temperature data from meteorological stations were only about level bare ground, and the influence of terrain or vegetable cover was not considered. Therefore, the data could not represent the information of region scale on mountainous area. Land surface temperature retrieval from remote sensing data, because of calculation theory, ground observation verification and spatiotemporal resolution, made it difficult to fulfill research on hydrology, land surface process and eco-hydrological process in alpine mountainous area. Land surface process models estimated land surface temperature in the experimental sites with high accuracy, but reduced the accuracy while upscale to the region scale on the mountainous cold area, because of the error from input control meteorological, soil and plant variables, and the error of ground observation site verification. The future research on land surface temperature on alpine mountainous cold regions should strengthen field observations and improve data accuracy, to build a physical land surface temperature estimation method with topographic and vegetation parameters, and to contribute to research on land-atmosphere-water process in alpine mountainous regions.  相似文献