2003年7月上旬张家界特大暴雨山洪分析   总被引：7，自引：4，他引：7  

周雨华  黄培斌  刘兵  张海  黄小玉  丁小剑 《气象》2004,30(10):38-42

对造成 2 0 0 3年 7月 8～ 1 0日张家界特大暴雨山洪的主要影响系统、物理量诊断场资料、多普勒雷达回波资料及自动气象站要素进行了分析 ,并重点分析了张家界特定的地形条件对降水的增幅作用及暴雨的夜发特征 ,为湘西北的暴雨山洪预报提供了一些有益的启示。  相似文献   

云南省Internet网络天气预报会商系统   总被引：1，自引：0，他引：1  

黄玮  李蒙  王月庆  陈坚  王灵 《气象》2004,30(10):52-55

云南省基于Internet网络的天气预报会商系统覆盖云南省、地 (州 )、县三级。系统采用了Internet网络技术、数据库技术 ,实现了省、地 (州 )、县天气预报发布及浏览查询、预报讨论BBS、天气预报会商室、系统管理 ,在线短消息互发等功能。  相似文献   

桥梁气象专题研究与服务   总被引：2，自引：0，他引：2  

刘聪张忠义  黄世成 《气象科技》2004,32(6):399-403

根据实际开展的桥梁气象专题研究，分析桥梁气象研究与服务如何面对国内大型桥梁建设发展趋势所带来的机遇和挑战，提出开展桥梁气象研究与服务的必要性，并从桥位气候背景、桥位气象参数取值、桥梁气象研究方法以及桥梁施工及营运期气象服务与保障等方面介绍桥梁气象专题研究及服务应开展的主要内容，同时，给出一个已投入实际使用的桥梁施工期气象环境监测与预警系统的建设思路。  相似文献   

夏季降水量与气温资料的恢复试验   总被引：3，自引：0，他引：3       下载免费PDF全文

黄嘉佑刘小宁  李庆祥 《应用气象学报》2004,15(2):200-206

该文对我国汛期降水量和气温缺测资料及资料均一性恢复的方法进行试验研究。对单个气候地区（东北区），以及全国6个气候地区用逐步回归和逐步判别方法进行缺测1～5年恢复试验。对东北地区内所有站点的试验表明，逐步判别分析方法比逐步回归分析方法恢复效果好些；选择邻站用判别分析方法建立的恢复模型，效果更好。全国气候地区试验表明，选择邻站的判别分析方法有较好的恢复效果。  相似文献   

基于GPRS的远程气象观测数据实时采集传输系统及其应用   总被引：9，自引：1，他引：9       下载免费PDF全文

刘聪 顾建吴国平  袁成松黄世成 《应用气象学报》2004,15(6):712-718

通过对远程自动气象站数据实时采集传输通讯方式的比较，提出基于通用分组无线业务（GPRS）的远程自动气象站数据实时采集和传输系统的技术方案，以小数据流方式，实现野外自动气象站观测数据的实时采集、传输和对观测设备运行的监控，达到节约经费，提高数据传输时效的目的，并将此系统成功地用于苏通长江公路大桥施工期气象环境监测与预警系统中。  相似文献   

南昌多普勒雷达与713-C雷达降水回波产品对比分析初探     

苏涵智  应冬梅  支树林  黄祖辉 《气象与减灾研究》2004,27(1):43-45

通过对比多普勒雷达和713-C雷达在同一时间、同一站点对降水回波的探测资料,找出它们在同类产品上的差异,对完成713-C雷达观测向多普勒雷达观测的过渡,用好多普勒雷达提供参考性意见。  相似文献   

A fast intensity-hue-saturation fusion technique with spectral adjustment for IKONOS imagery   总被引：11，自引：0，他引：11  

Te-Ming Tu Huang  P.S. Chung-Ling Hung Chien-Ping Chang 《Geoscience and Remote Sensing Letters, IEEE》2004,1(4):309-312

Among various image fusion methods, intensity-hue-saturation (IHS) technique is capable of quickly merging the massive volumes of data. For IKONOS imagery, IHS can yield satisfactory "spatial" enhancement but may introduce "spectral" distortion, appearing as a change in colors between compositions of resampled and fused multispectral bands. To solve this problem, a fast IHS fusion technique with spectral adjustment is presented. The experimental results demonstrate that the proposed approach can provide better performance than the original IHS method, both in processing speed and image quality.  相似文献   

面雨量不均对GIUH非线性改正探讨     

王煌赵会强  林隆钊孙春鹏 《水文》2004,24(6):14-16

地貌单位线(GIUH)基于流域地貌特征和概率方法，在我国许多地区得到广泛应用。针对面雨量分布不均问题，通过分析初始概率的变化，考虑GIUH的非线性改正，并用实际资料进行了验证。  相似文献   

Crustal structure of the southern Dabie ultrahigh-pressure orogen and Yangtze foreland from deep seismic reflection profiling   总被引：8，自引：0，他引：8  

Shuwen Dong  Rui Gao  Bolin Cong †  Zhongyan Zhao  Xiaochun Liu  Sanzhong Li  Qiusheng Li  Dongding Huang 《地学学报》2004,16(6):319-324

A new 140‐km‐long seismic reflection profile provides a high‐resolution crustal‐scale image of the southern Dabieshan high‐pressure (HP) metamorphic belt and the Yangtze foreland fold‐and‐thrust belt. The seismic image of the stacked section shows that the southern Dabieshan metamorphic terrane and Yangtze foreland belt are separated by a large north‐dipping fault. In the foreland the upper crust is dominated by a series of folds and thrusts formed during the collisional stage in the mid‐Triassic; it was reworked by crustal extension resulting in the formation of a late Jurassic and Cretaceous red‐bed basin. The southern Dabieshan profile shows stacked crustal slabs developed along the margin of the collisional orogenic belt. The Moho reflectors at 10–11 s (～30–33 km) are seismically prominent and segmented by a number of south‐verging thrusts that were probably developed by foreland‐directed thrusting of the deeply subducted continental crust during exhumation. The seismic reflection profile suggests that structures related to the Triassic–Jurassic subduction and exhumation of the Yangtze plate are preserved despite the severe crustal extension superimposed during the late Mesozoic and Cenozoic.  相似文献   

Acidification and Trace Metals of Lakes in Taiwan     

Chen-Tung Arthur Chen  Jiunn-Tzong Wu  Bing-Jye Wang  Kuo-Ming Huang 《Aquatic Geochemistry》2004,10(1-2):33-57

One hundred and eighty lakes, ponds and reservoirs in Taiwan, and the offshore islands have been investigated since 1985. Effects such as warming/cooling, mixing, photosynthesis and respiration on pH have been identified. These effects were found to be less profound than those resulting from the geology. Since there is little rain or lake water pH data available prior to 1970, it was necessary to use proxy data in order to ascertain the history of lake acidification. In this study, we present data based on diatoms in a sediment core collected from a lake in the remote subalpine region of southern Taiwan. The acidity of this lake water was found to have increased since 1900. We measured the concentrations of 55 chemical species in lake water samples. In addition, concentrations of 26 chemical species were obtained from sediments. Conductivity, alkalinity (HCO₃ ^?), most other major and minor chemical species, as well as the non sea-salt SO₄/Na ratio in lake water clearly decrease with elevation. Distribution of pH is similar, although the trend is less clear. Distribution of trace metals, however, shows a different trend as anthropogenic pollution, diagenetic reduction and lake acidification are at play.  相似文献