Stone cover and slope factors influencing hillside surface runoff and infiltration: laboratory investigation     

Jiin‐Shuh Jean  Koe‐Fe Ai  Kaimin Shih  Chao‐Chi Hung 《水文研究》2000,14(10):1829-1849

In this study, laboratory rainfall simulation in an extensive area was used to study the infiltration, and interception and storage from surface runoff in points with different stone cover percentages (0, 10, 20 and 30%) and slopes (5°, 10° and 20°). The experimental results of this study showed that the interrelationships among the slope, stone cover percentage, groundwater level, surface runoff amount, and interception and storage of the ponds were varied and irregular. No systematic patterns were detected for the change in the groundwater level, surface runoff amount, and interception and storage of the ponds with different stone cover percentages at different slopes and no threshold values were apparent. For a 5° slope, if the stone cover percentage was increased, the amount of surface runoff was reduced, the infiltration and the groundwater level experienced no significant change, and the interception and storage of the ponds increased. For a 10° slope, if the stone cover percentage was increased, the amount of surface runoff increased, the infiltration decreased, the groundwater level experienced no significant change or decreased slightly at certain points, and the interception and storage of the ponds increased. For a 20° slope, if the stone cover percentage was increased, the amount of runoff increased, the infiltration decreased, the groundwater level experienced no significant change or decreased slightly at certain points, and the interception and storage of the ponds increased. With or without stone cover, when the hydraulic conductivity of the top material is close to that of fine sand or laterite, an increase in the slope gradient decreased the amount of surface runoff and increased the storage amount of the ponds. As for the stone distribution, an interlaced style showed better performance in the interception and storage of ponds than that of a regular style. There was no significant change in the groundwater level. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Universal reconstruction method for radiometric quality improvement of remote sensing images     

Huanfeng Shen  Yaolin Liu  Tinghua Ai  Yi Wang  Bo Wu 《International Journal of Applied Earth Observation and Geoinformation》2010

The performance of remote sensing images in some applications is often affected by the existence of noise, blurring, stripes and corrupted pixels, as well as the hardware limits of the sensor with respect to spatial resolution. This paper presents a universal reconstruction method that can be used to improve the image quality by performing image denoising, deconvolution, destriping, inpainting, interpolation and super-resolution reconstruction. The proposed method consists of two parts: a universal image observation model and a universal image reconstruction model. In the observation model, most degradation processes in remote sensing imaging are considered in order to relate the desired image to the observed images. For the reconstruction model, we use the maximum a posteriori (MAP) framework to set up the minimization energy equation. The likelihood probability density function (PDF) is constructed based on the image observation model, and a robust Huber–Markov model is employed as the prior PDF. Experimental results are presented to illustrate the effectiveness of the proposed method.  相似文献   

我国反水雷支援舰能力建设探讨          下载免费PDF全文

倪华  赵治平  官红  艾艳辉 《数字海洋与水下攻防》2019,2(2):1-6

随着我国海军的战略转型,我军反水雷作战任务发生了变化,除了传统的近岸/ 近海反水雷任务,还增加了海峡反水雷、交通线反水雷以及海外基地反水雷等任务。 反水雷支援舰综合作战能力强、信息化与自动化程度高,在作战时为反水雷兵力提供指控、控制、通信及补给等方面的支持,快速提升反水雷系统的信息化、无人化、模块化水平,使反水雷装备能够协同工作,实现反水雷作战效能的最大化,是提高海军现有反水雷作战能力的理想装备。  相似文献   

高性能船在反水雷行业的发展及应用          下载免费PDF全文

漆万鹏  王盟  艾艳辉 《数字海洋与水下攻防》2019,2(4):28-32

反水雷行业的进步与高性能船的发展紧密相关，详细介绍了国外多种类型高性能船在反水雷行业中的应用，通过分析各类高性能船的外形结构特点，对其在反水雷行业广泛应用的原因进行了说明。同时对比了空中平台、水面平台以及水下平台等主要反水雷作业平台的属性特点，结合高性能船目前复合化发展的趋势，认为未来高性能船的跨介质应用将会是反水雷行业的一个重要方向。  相似文献