基于海量地理信息的网络存储系统设计与实现     

李大超 《测绘与空间地理信息》2011,34(3):66-67,70

概述了合肥测绘院网络存储系统的设计与实现过程,为城市勘测单位与相关行业海量地理信息的存储提供了有效的借鉴.  相似文献   

数字地形图的层次数据模型与存贮结构初探     

郭新成  李菊华  徐惠莲 《地球科学与环境学报》1997,(Z1)

本文从分析地形图的内容以及其相互关系、地形图符号、数字地形图的编辑、应用方面出发，得出了数字地形图的层次模型，给出了数字地形图的存贮结构。  相似文献   

辽宁省地下水硝酸盐污染成因分析及其防治对策探讨     

金速 《国土资源》1997,(1)

硝酸盐的含量直接影响地下水的环境质量，对人及动植物均有不同程度危害。通过辽宁省地下水硝酸盐监测资料及大量试验资料分析，对硝酸盐污染因素及其成因类型进行了系统研究，进而提出综合防治措施。  相似文献   

DYNAMIC MODEL FOR OIL SLICK DISPERSION INTO A WATER COLUMN- A WINDDRIVEN WAVETANK EXPERIMENT     

陆贤崑  李静  陈淑珠 《中国海洋湖沼学报》1993,(2)

A dynamic experiment for oil dispersion into a water column was performed with a 21 m long, 0.5 m wide, and 1 m high wind-driven wave tank. At wind velocity between 6-12 m/s and with the oil slide kept constant (about 1 um), the rate of the oil content increase in the water column could be approximated from the difference between the dispersion rate (R) of the oil slick and the coagulation rate (R') of the dispersed oil slick. Assuming the coagulation rate is directly proportional to the concentration of the water dispersed oil slick (i. e. R' =KC),, the integral form of the dynamic model can be expressed as C=R*[1-exp(-K*t)]/K and parameters R and K can be regressed with a computer. The relative deviation of model results from the experimental data was mainly less than 10%. The oil slick dispersion rate (R) had exponential relationship with the wind velocity (V), and can be fitted with a formula R=A*(U+1)B.The fitted constant of the coagulation rate, K(0.8-3.0* 10-3 min-1) did not have significant rela  相似文献   

Analysis of runoff characteristics in midstream of Yinma River     

YIShu-ping CHIBao-ming LIZhi-jun LIZhi-ping 《东北亚地学研究》2004,7(1):70-73

To use the water resources reasonably in the midstream of Yinma River is of great significance to Changchun City which is short of water. With the runoff data of physical measuring, the paper analyses the characteristics surface rtmoff of the area, by means of the groundwater flow numerical simulation, and represents the characteristics of the groundwater runoff in the area. Based on combination analyses of the two runoffs, the authors point out the problem of the water resources use in this area and bring forward a resolution of conjunctive regulation and storage of the surface water and groundwater.  相似文献   

Mechanisms of water storage in salt marsh sediments: The importance of dilation     

William K. Nuttle  Harold F. Hemond  Keith D. Stolzenbach 《水文研究》1990,4(1):1-13

  相似文献   

Time Variation In Hydrology and Gravity     

J. Riegger  A. Güntner 《Earth, Moon, and Planets》2004,94(1-2):41-55

In view of the pivotal role that continental water storage plays in the Earth’s water, energy and biogeochemical cycles, the temporal and spatial variations of water storage for large areas are presently not known with satisfactory accuracy. Estimates of the seasonal storage change vary between less than 50 mm water equivalent in areas with uniform climatic conditions to 450 mm water equivalent in tropical river basins with a strong seasonality of the climate. Due to the lack of adequate ground-based measurements of water storage changes, the evapotranspiration rate, which depends on the actual climatic and environmental conditions, is only an approximation for large areas until now, or it is based on the assumption that storage changes level out for long time periods. Furthermore, the partitioning of the water storage changes among different storage components is insufficiently known for large scales. The direct measurement of water storage changes for large areas by satellite-based gravity field measurements is thus of uttermost importance in the field of hydrology in order to close the water balance at different scales in space and time, and to validate and improve the predictive capacity of large-scale hydrological models. Due to the high spatial variability of hydrological processes temporal and spatial resolutions beyond that of GRACE are essential for a spatial differentiation in evapotranspiration and water storage partitioning.  相似文献   

天然气球罐基础沉降监测方法探讨     

王仙珍 《地球科学与环境学报》2002,24(2):65-67

以西安天然气储配站球罐工程为例,设计了球罐基础稳定监测的方法,通过实施和探讨,得出了一些有益的结论。  相似文献   

线阵CCD数据的高速采集与存储   总被引：14，自引：3，他引：11  

杨博雄  张晓华  傅辉清  欧同庚  陈志高 《大地测量与地球动力学》2004,24(2):124-127

在各种高精度线阵CCD应用系统中，需要对像元输出信号进行快速采样、存储及数据处理。CCD数据采集的采样速率不仅与A／D转换器的转换速率等因素有关，同时还与数据传送方式密切相关。以高精度线阵CCD TCD1501D和高速A／D转换器TLC5510为例．详细分析了CCD和A／D转换器的工作时序，采用CPLD设计方法，将CCD的输出信号进行高速A／D转换，并将结果直接存入存储器中。  相似文献   

Experimental study on the effectiveness of TLDs under wave loading     

Dong Sheng  Li Huajun  Lu Ming  Tomotsuka Takayama 《中国海洋大学学报(英文版)》2002,1(1):80-86

The objective of this study is to experimentally investigate the effectiveness of Tuned Liquid Dampers (TLDs) for suppressing the dynamic response of a platform structure subjected to wave loading and to explore the applicability of TLDs for suppressing the structural vibration of fixed offshore platforms. The experimental model is scaled according to a full size platform by matching its dynamic properties. Rectangular and circular TLDs of various sizes and water depths are examined.The experiments were performed in a 2-D wave flume. The effectiveness of TLDs is evaluated based on their response reduction. By observing the performance and the behavior of TLDs through laboratory experiments, the effects of a number of parameters including container shape, container size, number of dampers, frequency ratio, mass ratio, and incident wave characteristics are investigated.  相似文献