Preliminary study on assessment of nutrient transport in the Taihu Basin based on SWAT modeling   总被引：4，自引：0，他引：4  

LAI Geying  YU Ge  GUI Feng 《中国科学D辑(英文版)》2006,49(Z1)

With the Taihu Basin as a study area, using the spatially distributed and mechanism-based SWAT model, preliminary simulations of nutrient transport in the Taihu Basin during the period of 1995-2002 has been carried out. The topography, soil, meteorology and land use with industrial point pollution discharge, the loss of agricultural fertilizers, urban sewerage, and livestock drainages were all considered in the boundary conditions of the simulations. The model was calibrated and validated against water quality monitoring data from 2001 to 2002. The results show that the annual total productions of nitrogen (TN) and phosphorus (TP) into Lake Taihu are 40000t and 2000t respectively. Nutrient from the Huxi Region is a major resource for Lake Taihu. The non-point source (surface source) pollution is the main form of catchment sources of nutrients into Lake Taihu, occupied TN 53% and TP 56% respectively. TN and TP nutrients from industrial point pollution discharge are 30% and 16%, and sewerage in both forms of point source and non-point source are TN 31 % and TP 47%. Both the loss of agricultural fertilizers and livestock drainages from the catchment should be paid more attention as an important nutrient source. The results also show that SWAT is an effective model for the simulation of temporally and spatially nutrient changes and for the assessment of the trends in a catchment scale.  相似文献   

抑制型离子色谱法同时测定水中锂和锶   总被引：2，自引：0，他引：2  

桂建业  张永涛张莉 《岩矿测试》2006,25(1):87-88

对离子色谱法测定水中的锂、锶含量及其影响因素进行了研究。以甲烷磺酸为流动相，用IonPacCS12A阳离子色谱柱分离后，电导检测器同时测定矿泉水中锂和锶，其检出限分别为0．003mg／L和0．006mg／L。对Li^＋和Sr^2＋的离子色谱条件进行了优化，并对流动相的选择及干扰离子的影响进行了讨论。  相似文献   

基于GPRS的土地变更调查一体化系统应用探讨   总被引：1，自引：0，他引：1  

桂德竹  李钢  张成成 《测绘信息与工程》2006,31(5):26-28

介绍了基于GPRS公网的实时差分技术的土地变更调查的技术方法和工作流程,以徐州市数字国土土地变更调查为例,实现了基于GPRS公网的GPS-PDA采集、处理、分析土地变更信息的内外业一体化系统。  相似文献   

大港油田三维可视化解释技术的应用实例分析     

郎静 《应用地球物理》2006,3(3):179-186

三维可视化解释技术是一项全新的地震解释技术,与传统的地震资料解释有着本质的不同,它是从三维可视化显示出发,以地质体或三维研究区块为单元,采用点、线、面和体相结合的数据体空间可视化解释。该技术结合相干体技术可进行复杂断层的解释与组合;应用空间域层位自动追踪技术能够准确落实构造形态;采用目标雕刻技术,利用反演数据体可实现立体透视岩性体的空间展布及厚度趋势。将该技术应用在大港油田官西地区复杂断块构造解释和歧南西斜坡隐蔽油气藏储层预测两项实际工作中,取得了良好效果,表明可视化解释技术在石油勘探中具有广阔的应用前景,是提高勘探效率和勘探成功率的有效技术手段。  相似文献   

“3S”集成技术在“精准土地”调查中的应用研究   总被引：3，自引：0，他引：3  

桂德竹  张成成  李钢  付莉丽 《测绘科学》2007,32(4):155-156,100

本文探讨了土地变更调查常用方法在应用中的一些不足,简要介绍了综合“3S”集成技术的“精准土地”调查的原理和流程,并对应用中出现的坐标系统转换和精度偏移等问题进行了研究。  相似文献   

Doppler radar observation, CG lightning activity and aerial survey of a multiple downburst in southern Germany on 23 March 2001     

Nikolai Dotzek  Peter Lang  Martin Hagen  Thorsten Fehr  Werner Hellmiss 《Atmospheric Research》2007,83(2-4):519-533

Two downburst events from one thunderstorm are investigated, which occurred on 23 March 2001, in Germany's climatologic annual minimum of downburst activity. Observations by two Doppler radars are combined with hail reports, ground lightning detection and an aerial survey conducted after the event. The downburst-producing storm had formed at a synoptic convergence line within the warm sector of a cyclone. It had a remarkably high propagation speed of up to 31 m s^− 1 corresponding to the mid-tropospheric flow. Thus, by superposition with the storm motion, even two weak downbursts were sufficient to cause the observed damage of F1 and F2 intensity, respectively. While in its late stages, the storm was dynamically characterized by lower- and mid-tropospheric divergence; at about the time of the first downburst, a mesocyclonic vortex signature was verified. Aside from mid-tropospheric dry air entrainment, a thermodynamic explanation for the triggering of the two downbursts by melting of small hail according to recent findings by Atlas et al. [Atlas, D., Ulbrich, C.W., Williams, C.R., 2004. Physical origin of a wet microburst: observations and theory. J. Atmos. Sci. 61, 1186–1196] appears probable. Despite the lack of warnings to the public, the storm's potential for hail and strong straight-line winds was detected by the German weather service radar software CONRAD more than a half hour before the downbursts occurred.  相似文献   

Implications of broad dose distributions obtained with the single-aliquot regenerative-dose method on quartz fine-grains from loess     

S.C. Packman  B. Mauz  D.-D. Rousseau  P. Antoine  J. Rossignol  A. Lang 《Quaternary Geochronology》2007,2(1-4):39-44

Six samples were collected from a section of Peoria Loess in Eustis, North America, for optically stimulated luminescence (OSL) dating of quartz, and all except one (LV90) produced narrow dose distributions. A comparative study was conducted on this sample and on a ‘well-behaved’ sample (LV91), involving other dating methods and examination of the quartz OSL. These investigations revealed differences in the quartz OSL growth with dose, OSL response to thermal treatments and the range of components within the OSL signals. An ultra-fast component was found in LV90 that displayed a higher rate of sensitivity change than the fast component and this had a malign influence on the determination of the equivalent dose. The distinctive luminescence characteristics of LV90 imply either a change in wind dynamics and/or the source area for the silt.  相似文献   

高含沙泥浆模型试验及其糙率纠正     

归豪域  刘曙光  吴晓峰 《上海国土资源》2007,35(1):36-39,53

国内许多年久失修的地下设施在废弃时面临巨大的安全隐患,而利用高含沙泥浆进行填充是有效而经济的方法。在进行填充前,对管道填充的可行性需要建立模型进行试验研究。在模型试验研究时遇到的模型不相似问题是影响模型试验准确性的重要因素,因此要对试验所得数据进行修正。在本次研究中我们通过对于试验所得流速数据进行糙率纠正解决了糙率不相似的问题。  相似文献   

NetFlow技术在广东气象网络流量监测分析中的应用          下载免费PDF全文

肖文名郎洪亮  陈晓宇 《应用气象学报》2007,18(6):870-876

该文分析了NetFlow技术的基本原理, NetFlow协议的功能、用途、交换特点及NetFlow数据报文格式。 作为NetFlow在网络测量中的应用, 重点介绍了基于NetFlow的流量测量系统的架构, 详细介绍了NetFlow技术在广东省气象局网络流量监测中的应用。 结果表明: 利用NetFlow技术监测网络流量非常有效, 在实际业务应用中发挥了很好的作用, NetFlow技术适用于大型网络的流量采集分析。  相似文献   

Gauss-Markov模型的岭型GM估计     

马朝忠  张磊  归庆明  杜院录  韩松辉 《测绘学院学报》2007,(1)

针对目前文献中提出的各种抗差有偏估计没有对设计空间的粗差进行控制的问题,将岭估计与GM估计结合起来提出了一种新的抗差有偏估计———岭型GM估计,理论分析和计算结果均表明岭型GM估计不仅能消除法矩阵病态性的不良影响,而且能同时具有观测空间和设计空间的抗差性,是一种性能良好的估计。  相似文献