河道信息系统关键技术的研究   总被引：2，自引：2，他引：2  

王海军  杜今阳  姜瑞贤 《测绘信息与工程》2001,(4):10-13

介绍了长江河道信息系统研制背景、系统主要功能，对断面计算、槽蓄量计算及分析过程可视化等关键技术问题进行了研究。  相似文献   

灌注桩基础工程中的数据处理实例     

闫哲  闫纯有等 《中国煤田地质》2001,13(4):66-66,79

结合工程实例介绍了灌注桩工程中有关成孔体积、混凝土灌注量与钢筋笼重量等内容的精确计算公式，这些公式对灌注桩前期概算及施工后期工程量计算具有指导意义。  相似文献   

福建紫金山铜矿补充储量计算微机应用   总被引：3，自引：0，他引：3  

张运香  林全胜 《福建地质》2001,20(4):191-195

介绍紫金山铜矿补充储量计算徽机应用过程，简述应用PKPM软件进行储量计算所作的一系列改进，并为PKPM系列软件的进一步升级提出建设性意见。  相似文献   

水资源可利用量估算初步分析   总被引：20，自引：1，他引：20  

郭周亭 《水文》2001,21(5):23-26

水资源可利用量的概念、内涵、影响因素和制约条件都是研究可利用量计算方法所不可忽视的前提，探讨一种可行的计算方法，对水资源开发利用、区域工程规划、经济发展规划具有重要意义。通过对水资源开发利用程度及其发展状况分析研究，提出了不同开发利用条件下的计算方法。  相似文献   

载荷试验快速法的数据处理     

闫哲 《水文地质工程地质》2001,28(2):28-30

本文介绍了载荷试验快速法的基本内容，结合工程实例介绍了数据处理的过程，并简述了数据处理的电算法。  相似文献   

北京地区坡面径流计算模型的比较研究   总被引：14，自引：1，他引：14  

符素华  刘宝元  吴敬东  段淑怀 《地理科学》2002,22(5):604-609

利用北京市西南山区房山蒲洼两个坡耕地小区30场降雨径流资料和密云石匣示范区休闲地试验小区13场降雨径流资料，对Chu修正的Mein-Larson-Green-Ampt(GAML)、Phillip、Horton和SCS径流曲线数法4种径流计算公式进行了对比。结果表明：GAML和Phillip计算结果的模型确定性系数较高，Horton入渗曲线和SCS曲线数的计算结果模型确定性系数偏低。根据模型参数的易获得性，建议在北京山区，在有降雨过程资料时，使用Chu修正的GAML入渗曲线进行径流计算；若无降雨过程资料可用SCS径流曲线数进行径计算。本研究结果可用于北京地区径流量预报和水土资源评价。  相似文献   

散射辐射计算方法和气溶胶的气候效应   总被引：2，自引：3，他引：2  

钱永甫 《高原气象》1991,10(4):429-441

本文详细地介绍了大气散射辐射和辐射变温率的计算方法,并就气溶胶的概念、辐射特征以及气候效应进行了讨论。文中提出了求解辐射通量密度的迭代方法。本文是在各类数值模式中引入气溶胶气候效应的理论基础。  相似文献   

一次浮尘源地及其三维路径的计算   总被引：1，自引：0，他引：1  

任金声  董立清 《气象》1992,18(11):3-7

应用三维风场,借助计算气块路径的方法,对一次沙暴天气引起的浮尘飘移,进行了逆向追踪计算,得出了浮尘源地的位置和浮尘飘移的三维空间路径。经与天气实况对比,两者基本相符。这对于预测大气中污染物的飘移和确定污染源的位置,具有实际意义。  相似文献   

甘肃河西走廊实际水资源及其对林木适生程度的影响   总被引：5，自引：0，他引：5  

陈昌毓 《地理学报》1991,46(1):35-46

根据河西走廊近年来水资源研究中比较一致的结果,计算了各县市绿洲年、日平均气温≥10℃期间的实际水资源。采用张宝堃和H.L.彭曼的气候学方法,对各县市林木生长期的蒸散耗水量进行了估算,与实测和调查资料对照表明,两种估算值大致可分别反映林木基本正常生长和良好生长对水分的需求。提出了“实际干燥度”和“实际湿润度”的概念,并根据后者确定了各县市绿洲不同气候植被区林木的适生程度,以及应当选择的乔、灌木树种。  相似文献   

RESTORATION OF THE ORIGINAL TOPOGRAPHY OF THE XIAONANHAI LANDSLIDE IN CHONGQING AND CALCULATION OF ITS VOLUME          下载免费PDF全文

ZHOU Xin  ZHOU Qing  GAO Shuai-po  LI Xiao-feng 《地震地质》1979,42(4):936-954

As documented in history, an M6¼ earthquake occurred between Qianjiang, Chongqing and Xianfeng, Hubei(also named the Daluba event)in 1856. This earthquake caused serious geological hazards, including a lot of landslides at Xiaonanhai, Wangdahai, Zhangshangjie and other places. Among them, the Xiaonanhai landslide is a gigantic one, which buried a village and blocked the river, creating a quake lake that has been preserved to this day. As the Xiaonanhai landslide is a historical earthquake-induced landslide, it is impossible to obtain the remote sensing image and DEM data before the earthquake, which brings certain difficulties to the estimation of landslide volume and the establishment of numerical simulation model. In this paper, the original topography before the earthquake is inferred by the methods of geomorphic analogy in adjacent areas and numerical simulation, and the volume of the Xiaonanhai landslide body is calculated. Firstly, the principle and application of UAV aerial photography are introduced. We employed an unmanned airplane to take pictures of the Xiaonanhai landslide and adjacent areas, yielding high-precision DOM images(digital orthophoto graph)and DEM data which permit generating terrain contours with a 25m interval. We also used the method of intensive manual depth measurement in waters to obtain the DEM data of bottom topography of Xiaonanhai quake lake. Based on field investigations, and combining terrain contours and DOM images, we described the sizes and forms of each slump mass in detail. Secondly, considering that the internal and external dynamic geological processes of shaping landforms in the same place are basically the same, the landforms such as ridges and valleys are also basically similar. Therefore, combining with the surrounding topography and landform of the Xiaonanhai area, we used MATLAB software to reconstruct two possible original landform models before the landslide. The original topography presented by model A is a relatively gentle slope, with a slope of 40°~50°, and the original topography presented by model B is a very high and steep slope, with a slope of 70°~80°. Thirdly, Geostudio software is used to conduct numerical simulation analysis on the slope stability. The safety factor of slope stability and the scale of landslide are analyzed under the conditions of static stability, seismic dynamic response and seismic dynamic response considering topographic amplification effect. The results show that large landslide is more likely to occur in model B, which is more consistent with the reality. In order to verify the credibility of recovered DEM data of valley bottom topography, we visited the government of Qianjiang District, collected the drilling data of 11 boreholes in two survey lines of Xiaonanhai weir dam. It is verified that the recovered valley bottom elevation is basically consistent with that revealed by the borehole data. Finally, according to the two kinds of topographic data before and after the landslide, the volume of the landslide is calculated by using the filling and excavation analysis function of ArcGIS software. There is a gap between the calculation results of filling and excavation, the filling data is 3×10⁶m³ larger than the excavation data. The reasons are mainly as follows: 1)Due to the disorderly accumulation of collapse blocks, the porosity of the accumulation body became larger, causing the volume of the fill to expand; 2)It has been more than 150a since the Xiaonanhai earthquake, and the landslide accumulation has been seriously reconstructed, therefore, there are some errors in the filling data; 3)The accumulation body in Xiaonanhai quake lake might be subject to erosion and siltation, this may affect the accuracy of the filling data. In conclusion, it is considered that the calculated results of the excavation are relatively reliable, with a volume of 4.3×10⁷m³.  相似文献