基于Flash+ASP构建地质灾害隐患WebGIS初探

基于Flash+ASP技术方案,以黄平县为研究区,进行了广泛地野外勘测和室内各类空间、属性数据的整编,获取了黄平县域内地质灾害隐患点的时空信息,并结合数据库管理系统,从系统设计、空间数据库建立和系统功能设计等方面构建了黄平县地质灾害隐患WebGIS。该系统实现了地质灾害隐患点实时动态监测与灾情预测分析的网络化管理,为地质灾害防治工作提供有效辅助决策。     

Towards flash-flood prediction in the dry Dead Sea region utilizing radar rainfall information

Flash-flood warning models can save lives and protect various kinds of infrastructure. In dry climate regions, rainfall is highly variable and can be of high-intensity. Since rain gauge networks in such areas are sparse, rainfall information derived from weather radar systems can provide useful input for flash-flood models. This paper presents a flash-flood warning model which utilizes radar rainfall data and applies it to two catchments that drain into the dry Dead Sea region. Radar-based quantitative precipitation estimates (QPEs) were derived using a rain gauge adjustment approach, either on a daily basis (allowing the adjustment factor to change over time, assuming available real-time gauge data) or using a constant factor value (derived from rain gauge data) over the entire period of the analysis. The QPEs served as input for a continuous hydrological model that represents the main hydrological processes in the region, namely infiltration, flow routing and transmission losses. The infiltration function is applied in a distributed mode while the routing and transmission loss functions are applied in a lumped mode. Model parameters were found by calibration based on the 5 years of data for one of the catchments. Validation was performed for a subsequent 5-year period for the same catchment and then for an entire 10-year record for the second catchment. The probability of detection and false alarm rates for the validation cases were reasonable. Probabilistic flash-flood prediction is presented applying Monte Carlo simulations with an uncertainty range for the QPEs and model parameters. With low probability thresholds, one can maintain more than 70% detection with no more than 30% false alarms. The study demonstrates that a flash-flood warning model is feasible for catchments in the area studied.     

基于Flash+XML+ASP技术的互动式网络地图构建

通过对现今较为成熟的网络地图发布技术及其实现方式进行比较研究,提出了利用Flash＋XML＋ASP技术构建互动式网络地图的新方法,详细介绍了采用此方法构建互动式网络地图的技术流程及具体实现方法,实现了真正意义上的“瘦客户端”的互动式网络地图。     

青藏高压前部突发性局地强暴雨的初步研究

本文通过对一次500hPa青藏高压前部的突发性强暴雨天气的诊断分析，揭示了暴雨产生的环境场特征。利用带通滤波方法,分析了与暴雨天气密切相关的中尺度系统及发展机理，获得了一些对业务预报有指导意义的结果。     

基于Flash开发多媒体电子地图的方法

通过分析解决基于Flash技术构建多媒体电子地图中的几个问题,具体说明包括地图数据转换和使用功能的实现方法。     

Hydraulic model tests for propagation of flow and sediment in floods due to breaking of a natural landslide dam during a mountainous torrent

During mountain torrents, large-magnitude floods may result from heavy rainfall and cause the breakage of landslide dams naturally formed by heavy rainfall, earthquakes, and so on. The characteristics of longitudinal spreading of clear water discharge and changes in flow depth must be clarified because the changes in peak depth have not yet been examined in steep-slope torrents and because there are few data on spreading of flash floods and related sedimentation in mountainous torrents. In the present study, experimental data were collected through hydraulic model tests over a rigid bed, and the spreading of water, fine sediment, bed load, and large boulders due to flooding are discussed assuming that flash flooding/debris flows occur in the upstream reach. The effects of changes in flow width, such as expansions and contractions in the flow width, as well as changes in meandering channels, sediment transportation, and spreading flow depth resulting from bores are examined using flume data for a steep-slope torrent. The data obtained in the present study reveal that fine sediment components are transported to the downstream reach if large-magnitude floods occur and that the spreading rate and peak lags of the fine sediment and water level indicate the occurrence of a flood in the upstream reach.     

前期土壤湿度和降雨对小流域山洪预警指标的影响评估

山洪灾害临界雨量预警指标受多种因素影响,尤其是前期土壤湿度状况和降雨变化。基于分布式水文模型和情景分析法确定安徽省岳西流域的山洪灾害临界雨量集合,评估前期土壤湿度状况、雨型和预警时段对临界雨量变化的影响。研究表明：① 中国山洪水文模拟系统在研究区内具有较好的适用性,率定期和验证期的平均径流深和洪峰流量相对误差均在15%以内,平均峰现时间误差在1h以内,平均Nash-Sutcliffe系数为0.79和0.77;② 60种情景模式下,池墩组村的临界雨量集合为141~528 mm;③ 前期土湿状况和雨型均显著影响临界雨量变化,随着土壤饱和率从0.20分别增加到0.50和0.80,临界雨量分别减少13.7%~16.2%和26.8%~31.8%;短历时预警时,临界雨量由大到小的相应雨型分别为减弱雨型、中间雨型和增强雨型。研究可为山洪灾害预报和早期预警提供理论支持,也为中国山洪灾害防治提供参考和借鉴。     

"测量学"教学动画软件研制

为更好地开展"测量学"教学,提高教学质量与效率,以Flash为开发工具,研制开发了"测量学"多媒体动画教学软件.这些动画软件能够生动形象地表现测量的原理与过程、展现仪器的操作使用细节,可激发学生的学习兴趣,丰富教学内容,能够增强教学效果,提高教学质量.     

基于Flash+XML+ASP技术的互动式网络地图构建

随着网络地图的迅猛发展,互动式网络地图兴运而生。笔者通过对现今较为成熟的网络地图发布技术及其实现方式进行比较研究,提出了利用Flash+XML+ASP技术构建互动式网络地图的新方法,并在此基础上详细介绍了采用此方法构建互动式网络地图的技术流程及具体实现方法,实现了真正意义上的"瘦客户端"的互动式网络地图。     

轻污油储罐设闪蒸系统初探

文章针对轻污油储存现状,在轻污油进储罐前设置闪蒸系统,气相轻组分排入全厂低压瓦斯系统;液相组分经轻污油增压泵送至轻污油储罐。该闪蒸系统可以有效防止气相轻烃进入轻污油储罐,保障设备平稳运行,避免憋罐、拔顶、爆炸等事故的发生。