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FRAMEWORK OF EXTREME FLOOD RISK MANAGEMENT IN THE TYPHOON COUNTRY REGION
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作者 CHO-RONG KIM 《热带气旋研究与评论(英文版)》 2019年第1期35-45,共11页
Recently, flood damages have increased worldwide due to global warming and climate change. According to the Report of the Intergovernmental Panel on Climate Change(IPCC), extreme weather events such as heat wave, drou... Recently, flood damages have increased worldwide due to global warming and climate change. According to the Report of the Intergovernmental Panel on Climate Change(IPCC), extreme weather events such as heat wave, drought, and flood are expected to increase in the future. It is thus necessary to realize that larger and more frequent flood disasters are rapidly nearing us, and need to prepare for them accordingly. This research aims to provide a framework for extreme flood management, beginning with the establishment of extreme flood definition from a more general point of view through reviewing existing literature and references. Also, the purpose of this research is to identify the current status of flood forecasting in the ESCAP/WMP Typhoon Committee’s member countries and to provide recommendations on extreme flood forecasting and flood risk management.in member countries. 展开更多
关键词 EXTREME FLOOD FLOOD DAMAGE EXTREME FLOOD Forecasting System(EFFS) FLOOD risk management
广西历史洪水相似性查找数据挖掘与应用 预览
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作者 刘文丽 吴立愿 滕培宋 《广西水利水电》 2019年第2期25-28,共4页
利用数据挖掘技术,依据洪水相似性度量指标,在水文数据库中进行历史洪水相似性查找,实现实时洪水过程与历史洪水过程的可视化对比分析,为实时洪水过程演化预测预报提供依据,为提高洪水预报精度和科学的实时洪水调度决策提供支撑。目前... 利用数据挖掘技术,依据洪水相似性度量指标,在水文数据库中进行历史洪水相似性查找,实现实时洪水过程与历史洪水过程的可视化对比分析,为实时洪水过程演化预测预报提供依据,为提高洪水预报精度和科学的实时洪水调度决策提供支撑。目前广西大部分站点为新建的中小河流报汛站,水文资料较少,预警预报方案精度低,通过历史洪水相似性查找数据挖掘应用对从理论上解决水文资料匮乏地区水文规律的探求也具有一定的价值。 展开更多
关键词 洪水 相似性 数据挖掘 洪水预报
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Different Flooding Behaviors Due to Varied Urbanization Levels within River Basin: A Case Study from the Xiang River Basin,China
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作者 Juan Du Linlin Cheng +2 位作者 Qiang Zhang Yumeng Yang Wei Xu 《国际灾害风险科学学报:英文版》 CSCD 2019年第1期89-102,共14页
Booming urbanization due to a fast-growing population results in more impervious areas, less infiltration,and hence greater flood peak and runoff. Clear understanding of flood responses in regions with different level... Booming urbanization due to a fast-growing population results in more impervious areas, less infiltration,and hence greater flood peak and runoff. Clear understanding of flood responses in regions with different levels and expansions of urbanization is of great importance for regional urban planning. In this study, comparison of flooding responses to urbanization processes in terms of flood peak and runoff volume in the upper, middle,and lower Xiang River Basin(XRB), China, was carried out using the Hydrologic Engineering Center-Hydrologic Modeling System(HEC-HMS) model. From 2005 to 2015, urbanization level and intensity were higher in the lower XRB compared to the upper and middle XRB, and the overall expansion rate of urban areas was 112.8%.Modeling results by the HEC-HMS model indicate elevated flood peak discharges and volumes due to fast urbanization in the XRB from the 1980 s to 2015. This rapid increase is particularly the case in the lower XRB. The study also revealed different hydrological responses of flood regimes—urbanization tends to have larger impacts on peak flood flow rather than on flood volume in the lowerXRB, which further corroborated urbanization-induced intensifying flood processes in terms of peak flood flow.Urbanization has increasing impacts on flood volume from the upper to the lower XRB, which can be attributed to accumulated runoff down the river system. This study provides a reference for basin-wide land use and urban planning as well as flood hazard mitigation. 展开更多
关键词 FLOOD volume FLOODING processes HECHMS PEAK FLOOD flow URBANIZATION level Xiang River Basin China
Sensitivity evaluation of the flash flood warning system introduced to ungauged small mountainous basins in Korea
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作者 YOO Chulsang LEE Jinwook +1 位作者 CHANG Kwonhee YANG Dongmin 《山地科学学报:英文版》 SCIE CSCD 2019年第5期971-993,共23页
This study evaluates the uncertainty involved in the determination of the flash flood guidance(FFG) of the flash flood warning system(FFWS) for a small mountainous region(FFWS_MR)in Korea. The sensitivity is evaluated... This study evaluates the uncertainty involved in the determination of the flash flood guidance(FFG) of the flash flood warning system(FFWS) for a small mountainous region(FFWS_MR)in Korea. The sensitivity is evaluated both at each step to determine the FFG and for all steps together. The results show that the relative difference of the FFG is about 50% of the current system, most of which involves the channel width. Especially, the use of some specific empirical equations to estimate the major parameters results in a considerable amount of the relative difference of the FFG. In addition, though only four basins were field-surveyed, it is found that the indirect estimation of the major parameters always introduces some amount of additional uncertainty. In conclusion, accurate estimation of the major parameters must be the most important procedure to derive an accurate FFG, among which the channel cross-section at the exit of the basin lies at the center. 展开更多
关键词 FLASH FLOOD WARNING system FLASH FLOOD GUIDANCE Sensitivity analysis
Performance assessment of two-dimensional hydraulic models for generation of flood inundation maps in mountain river basins 预览
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作者 Juan Pinos Luis Timbe 《水科学与水工程:英文版》 EI CAS CSCD 2019年第1期11-18,共8页
Hydraulic models for the generation of flood inundation maps are not commonly applied in mountain river basins because of the difficulty in modeling the hydraulic behavior and the complex topography. This paper presen... Hydraulic models for the generation of flood inundation maps are not commonly applied in mountain river basins because of the difficulty in modeling the hydraulic behavior and the complex topography. This paper presents a comparative analysis of the performance of four twodimensional hydraulic models (HEC-RAS 2D, Iber 2D, Flood Modeller 2D, and PCSWMM 2D) with respect to the generation of flood inundation maps. The study area covers a 5-km reach of the Santa B-arbara River located in the Ecuadorian Andes, at 2330 masl, in Gualaceo. The model's performance was evaluated based on the water surface elevation and flood extent, in terms of the mean absolute difference and measure of fit. The analysis revealed that, for a given case, Iber 2D has the best performance in simulating the water level and inundation for flood events with 20- and 50-year return periods, respectively, followed by Flood Modeller 2D, HEC-RAS 2D, and PCSWMM 2D in terms of their performance. Grid resolution, the way in which hydraulic structures are mimicked, the model code, and the default value of the parameters are considered the main sources of prediction uncertainty. 展开更多
关键词 TWO-DIMENSIONAL hydraulic MODELS FLOOD modeling FLOOD extent Water surface ELEVATION High MOUNTAIN river Ecuador
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SCENARIO-BASED URBAN FLOOD FORECAST WITH FLOOD INUNDATION MAP
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作者 JINHOON KIM HYOSEOB CHO 《热带气旋研究与评论(英文版)》 2019年第1期27-34,共8页
The objective of this study is to introduce how to apply the urban flood forecast with numerous flood inundation map scenario in Korea. In modeling of urban flood, drainage networks 1D model like SWMM(Storm Water Mana... The objective of this study is to introduce how to apply the urban flood forecast with numerous flood inundation map scenario in Korea. In modeling of urban flood, drainage networks 1D model like SWMM(Storm Water Management Model) used to analysis stormwater runoff within drainage pipe system and 2D surface model used to simulate inundation area and depth. This 1D-2D model(drainage network 1D coupled to 2D surface model) is used to make the inundation map of urban flood. The accuracy of the 2D model is highly dependent of the input data resolution. The cell by cell running on these high surface resolution need to be required more computation time. Thus, the 1D-2D models have some limitations in using operational real-time forecast. In this sense, the scenario-based approach can be a good alternative method to forecast urban flood. The flood inundation maps would be completed with 320 rainfall scenarios which are finely divided according to rainfall intensity and duration on the basis of design rainfall. The forecast process is very simple if we use pre-existing scenarios. We use a predicted radar rainfall as input for simulated scenario selection, and then selected inundation map would be serviced to people. In this study, the current results for the scenario-based urban flood forecast with flood inundation map are demonstrated. 展开更多
关键词 urban FLOOD FORECAST FLOOD inundation MAP scenario-based radar rainfall estimation
ESTABLISHMENT OF ASSESSMENT SYSTEM FOR STRUCTURAL FLOOD CONTROL MEASURES
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作者 CHO-RONG KIM 《热带气旋研究与评论(英文版)》 2019年第1期46-52,共7页
Due to abnormal weather environment such as global warming and greenhouse effect, the risk of flood has been increased with larger scale of flood damages. In this regard, it is needed to establish a comprehensive and ... Due to abnormal weather environment such as global warming and greenhouse effect, the risk of flood has been increased with larger scale of flood damages. In this regard, it is needed to establish a comprehensive and integrated system to evaluate the most optimized measures for flood control through eliminating uncertainties of socio-economic impacts. Assessment System of Structural Flood Control Measures(ASFCM) was developed for determining investment priorities of the flood control measures and establishing the social infrastructure projects. ASFCM consists of three modules: 1) the initial setup and inputs module, 2) the flood and damage estimation module, and 3) the socio-economic analysis module.First, the D/B for flood damage estimation was constructed, which is the initial and input data about the estimation unit, property, historical flood damages, and topographic and hydrological data in the target area were applied. After that, it is important to classify local characteristic for constructing flood damage data. Five local characteristics(big city, medium size city, small city, farming area, and mountain area) are classified by criterion of application(population density). Next step is the floodplain simulation with HEC-RAS which is selected to simulate inundation. Through inputting the D/B and damage estimation, it is able to estimate the total damage(only direct damage) that is the amount of cost to recover the socio-economic activities back to the safe level before flood did occur. The last module suggests the economic analysis index(B/C ratio) with Multidimensional Flood Damage. Consequently, ASFCM suggests the reference index in constructing flood control measures to reduce water-related damage and decision-makers can choose the proper flood control measures in the socioeconomic aspects. 展开更多
关键词 ASFCM SOCIO-ECONOMIC assessment FLOOD DAMAGE STRUCTURAL FLOOD control HEC-RAS
雅砻江流域非一致性洪水分析 预览
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作者 梁小青 纪昌明 +2 位作者 张验科 俞洪杰 阎晓冉 《水力发电》 北大核心 2019年第7期11-17,共7页
雅砻江干流下游河段大规模梯级水电站的逐步开发改变了下垫面条件,同时也改变了天然洪水的分布特性,不再满足传统洪水频率分析中对其一致性的要求。通过定性和定量分析,得出雅砻江锦屏一级水电站年最大1日洪量和年最大3日洪量均在1989... 雅砻江干流下游河段大规模梯级水电站的逐步开发改变了下垫面条件,同时也改变了天然洪水的分布特性,不再满足传统洪水频率分析中对其一致性的要求。通过定性和定量分析,得出雅砻江锦屏一级水电站年最大1日洪量和年最大3日洪量均在1989年发生变异。在此基础上,针对年最大1日洪量及其发生日期两个变量进行了研究。首先以变异年份1989年将原序列划分为两个子序列,并构造了P-Ⅲ混合分布模型;其次应用方向数据统计理论,将Von Mises分布作为其发生日期的分布;最后通过Clayton Copula函数求取了两变量的联合超越概率分布、条件超越概率密度等。分析结果可为该电站合理确定设计洪水及汛期防洪调度提供相关参考。 展开更多
关键词 洪水 非一致性 混合分布 Von Mises分布 雅砻江流域
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2018年阿速坡省洪涝灾害中腹泻疾病的调查分析
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作者 吴凡 李志强 +5 位作者 谭俊杰 叶丽娟 蒋凯 崔琳 郑伟 谭映军 《军事医学》 CAS 北大核心 2019年第2期150-154,共5页
目的分析"2018-中老和平列车"在老挝阿速坡省溃坝洪涝灾害医学救援中收集患者疾病发生的特点,为热带、亚热带气候雨季洪涝灾害的异国救援及疾病防治提供依据及经验。方法根据伤病员的病因、临床症状、既往病史等进行诊断,采... 目的分析"2018-中老和平列车"在老挝阿速坡省溃坝洪涝灾害医学救援中收集患者疾病发生的特点,为热带、亚热带气候雨季洪涝灾害的异国救援及疾病防治提供依据及经验。方法根据伤病员的病因、临床症状、既往病史等进行诊断,采取国际疾病分类法(ICD-10)收集整理资料,采用描述性分析方法对洪涝灾害后人数最多的腹泻病员的年龄分布、高发时间及发热时间进行回顾性分析。结果共收集1000例完整病例资料,其中腹泻病例高达169例,男性45.56%(77/169),女性54.44%(92/169),男女比例为0.84∶1;年龄跨度0~87岁,平均(58.3±19.6)岁,其中4~6岁构成比较高,为21.30%,>66岁老年人构成比高达27.81%。洪涝灾害后腹泻病员量在第3~5天上升较快,高峰出现在第5天,第9~10天为稳定期;发热人数的升高或降低与腹泻人数整体一致,并低于不发热者,第6天发热人数达高峰,第7~8天明显下降。结论腹泻疾病在洪涝灾害后极易出现暴发流行,伴发热的腹泻更是多种传染性疾病的暴发点,因此,腹泻病员的早期监测、预防和治疗能有效降低相关疾病的暴发风险。 展开更多
关键词 灾害医学 和平 救援 洪涝 腹泻 发热
巴丹吉林沙漠南缘地下水补给机制研究 预览
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作者 魏世博 聂振龙 +4 位作者 申建梅 崔亚莉 王哲 孟令群 刘学全 《人民黄河》 CAS 北大核心 2019年第2期88-93,共6页
为研究巴丹吉林沙漠南缘水源地的地下水补给机制,分析了采自浅井、深井及湖泊的35个水样的Cl-浓度、TDS含量和氢氧同位素特征。根据巴丹吉林水源地及周边水化学水平分布特征,结合研究区气象和水文条件、水文地质结构、地下水流场发现,... 为研究巴丹吉林沙漠南缘水源地的地下水补给机制,分析了采自浅井、深井及湖泊的35个水样的Cl-浓度、TDS含量和氢氧同位素特征。根据巴丹吉林水源地及周边水化学水平分布特征,结合研究区气象和水文条件、水文地质结构、地下水流场发现,戈壁区地下水对沙漠区地下水无明显补给作用,但是沙漠区、戈壁区及山区地下水稳定同位素关系表明,沙漠区地下水来源于南部山区及戈壁区的地下水或降水。通过野外调查发现,沙漠边缘分布大量洪积黏土,认为沙漠外围山区、山前戈壁带降水在季节性河道形成的脉冲式洪流是沙漠区地下水的重要补给来源之一,这一认识不仅解释了采用水化学和同位素技术进行分析而获得不同结论的原因,而且有利于地下水资源评价. 展开更多
关键词 地下水 补给机制 水化学 稳定同位素 洪水 巴丹吉林沙漠
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清代汾河流域洪涝灾害发展与土壤侵蚀之关系 预览
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作者 任世芳 《水资源研究》 2019年第3期274-279,共6页
在对地方史志及清宫档案中相关史料进行统计整理和量化分析的基础上,应用滑动平均和斯波曼秩次相关检验两种趋势分析方法,对清代汾河流域洪涝灾害的发展趋势进行研究,结果显示268年间洪涝灾害的严重程度呈增长趋势;通过对同期人口、耕... 在对地方史志及清宫档案中相关史料进行统计整理和量化分析的基础上,应用滑动平均和斯波曼秩次相关检验两种趋势分析方法,对清代汾河流域洪涝灾害的发展趋势进行研究,结果显示268年间洪涝灾害的严重程度呈增长趋势;通过对同期人口、耕地数量等社会因素变化情况的分析,探寻了洪涝灾害数量增长的原因。结论认为:清代人口的迅速增加导致建筑用材和燃料的需求大增,伴随而来的开垦荒地和砍伐山林植被等人类活动使该区土壤侵蚀量增加,从而导致河槽泥沙淤积、河道行洪能力降低等情况的发生,这些情况均使河流泛滥和破堤的风险增加,并最终导致流域水患数量不断增长。 展开更多
关键词 清代 汾河流域 洪涝灾害 土壤侵蚀
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Estimation of peak runoff and frequency in an ungauged stream of a forested watershed for flood hazard mapping 预览
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作者 Refik Karagul Tarik Citgez 《林业研究:英文版》 CAS CSCD 2019年第2期555-564,共10页
frequencies.The aim of this research was to determine the measures needed to protect the towns and villages from this type of damage.Daily total precipitation data for 1975–2010 were analysed,and rainfall-runoff mode... frequencies.The aim of this research was to determine the measures needed to protect the towns and villages from this type of damage.Daily total precipitation data for 1975–2010 were analysed,and rainfall-runoff models developed to estimate the potential yearly maximum discharge from each stream of sub-watersheds dominated by forests and/or agriculture.This was then calculated for different frequencies of the yearly maximum discharge.Flood analysis and mapping was modified via the one-dimensional Hydrologic Engineering Centers-River Analysis System software to produce potential maximum discharge and geometric data for Kaynasli Creek.As the main creek of the sub-watershed,its crosssection was shown to be insufficient and incapable of containing the maximum discharge at the 100-year frequency presumed for the watershed,and subsequently was seen as having a high level of casualty risk.It was concluded that the one dimensional model could be useful,but 2D models were more suitable for these types of watersheds. 展开更多
关键词 Flood FREQUENCY ANALYSIS FLOODPLAIN MAPPING Flow simulation Hydrologic Engineering Centers-River ANALYSIS System(HEC-RAS) Soil Conservation Service Curve Number(SCS-CN)
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关中盆地城市群发展中几个关键基础地质问题 预览
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作者 董英 宋友桂 +4 位作者 张茂省 兰敏文 付晓芬 刘慧芳 宁强强 《西北地质》 CAS CSCD 北大核心 2019年第2期12-26,共15页
关中盆地属于断陷盆地,地质构造复杂,活动断裂发育,地震活动频繁,城市建设中面临一系列重大基础地质问题。在搜集分析关中盆地1 000多个各类钻孔数据的基础上,对关中盆地城市群1∶5万综合地质调查中实施的主要钻井和剖面进行研究,探讨... 关中盆地属于断陷盆地,地质构造复杂,活动断裂发育,地震活动频繁,城市建设中面临一系列重大基础地质问题。在搜集分析关中盆地1 000多个各类钻孔数据的基础上,对关中盆地城市群1∶5万综合地质调查中实施的主要钻井和剖面进行研究,探讨了城市群发展中面临盆地形成演化与活动断裂规避、第四系下限与关中盆地三维地质结构重建、水系演化与城市发展、历史时期古洪水事件与海绵城市建设等基础地质问题。研究表明:①关中裂陷形成于中晚白垩纪,始新世开始成湖,经过多次断陷与隆起,形成2个沉积中心,到上新世时湖泊扩展达到最大范围,盆地第四纪以来仍处于持续、缓慢的下降接受沉积过程,受秦岭持续构造隆升的影响,沉积中心由南向北迁移,这将对城市群布局产生重要影响。关中盆地城市群建设要回避断裂交汇处、端点和断层运动的枢纽部位。②建议将绿三门组划为上新统,不宜划分到第四系,三门组的形成时代是穿时的,在关中盆地第四系与地下空间规划的时候需要进行关注和纠正。③城市规划建设要遵循河湖演化的自然规律和区域地质地貌特征,千年、百年一遇的洪水水位分别高于河漫滩7m和2.2m,最大年降水量超过900mm,但季节分布不均,可作为城市防洪水和海绵城市建设的设计依据。 展开更多
关键词 关中盆地 地质环境 第四系下限 渭河水系 洪水
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Flume experimental study on evolution of a mouth bar under interaction of floods and waves 预览
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作者 Li Yan Men-wu Wu +2 位作者 Ying Chen Yao Wu Tian-sheng Wu 《水科学与水工程:英文版》 EI CAS CSCD 2019年第2期162-168,共7页
Based on the characteristics of hydrodynamics and sediment transport in the bar area in the Modaomen Estuary,a flume experiment was performed to study the evolution of the longitudinal profile of the mouth bar.The mou... Based on the characteristics of hydrodynamics and sediment transport in the bar area in the Modaomen Estuary,a flume experiment was performed to study the evolution of the longitudinal profile of the mouth bar.The mouth bar evolution was investigated under the impacts of floods with different return periods as well as flood-wave interaction.The results showed that floods with different return periods had significant influences on the evolution of the river mouth bar.Particularly on the inner slope of the mouth bar,the sediment was substantially active and moveable.The inner slope and the bar crest tended to be remarkably scoured.The erosion was intensified with the increase of the magnitude of floods.Moreover,the bar crest moved seawards,while the elevation of the bar crest barely changed.Under the flood-wave interaction,a remarkable amount of erosion on the inner and outer slopes of the mouth bar was also found.The seaward displacement of the bar crest under the interaction of floods and waves was less than it was under only the impact of floods,while more deposition was found on the crest of the mouth bar in this case. 展开更多
关键词 MODAOMEN MOUTH bar Wave FLOOD FLUME experiment SEDIMENT transport
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辽宁省大洋河流域暴雨洪水特征分析 预览
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作者 叶天舒 金鑫 蔡涛 《中国防汛抗旱》 2019年第7期29-32,共4页
大洋河流域处于辽宁省暴雨洪水的频发区,介绍了大洋河流域概况,系统分析了流域内致灾暴雨洪水的时空分布和综合雨洪特征,进行了暴雨洪水分区,并简要分析其原因,为该地区防洪决策、水利工程设计规划、水资源规划利用等提供科学支撑。
关键词 大洋河流域 暴雨 洪水 分区
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基于白塔堡河干流设计洪水及合理性探析 预览
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作者 曹博 《吉林水利》 2019年第2期33-37,共5页
白塔堡河为山区与平原混合产流的小河流,其洪水由山区和平原两部分洪水组成,因此设计洪水计算按山区洪水和平原洪水分别计算。现状条件下,白塔堡河发生20年一遇洪水和100年一遇洪水时,洪水漫溢,而在规划条件下,白塔堡河发生20年一遇洪水... 白塔堡河为山区与平原混合产流的小河流,其洪水由山区和平原两部分洪水组成,因此设计洪水计算按山区洪水和平原洪水分别计算。现状条件下,白塔堡河发生20年一遇洪水和100年一遇洪水时,洪水漫溢,而在规划条件下,白塔堡河发生20年一遇洪水和100年一遇洪水时,洪水均不会发生漫堤。但发生100年一遇洪水时,堤防有破坏的可能,洪水对下游防洪安全有一定的威胁。白塔堡河无水文站观测资料,本次规划经过分析计算,其成果是比较合理的。 展开更多
关键词 设计流量 洪水 遭遇 白塔堡河
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明代江西地区水灾时空特征 预览
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作者 赵彦风 《商洛学院学报》 2019年第1期82-86,共5页
基于《中国三千年气象记录总集》收集的气象资料,建立了明代(1368—1643年)江西地区水灾的数据库,根据灾情程度将水灾的等级划分为轻度、中度、重度3个等级,从时间和空间两方面统计、分析了明代江西水灾的分布特征及发生规律。明代共发... 基于《中国三千年气象记录总集》收集的气象资料,建立了明代(1368—1643年)江西地区水灾的数据库,根据灾情程度将水灾的等级划分为轻度、中度、重度3个等级,从时间和空间两方面统计、分析了明代江西水灾的分布特征及发生规律。明代共发生水灾787县次,平均每年发生约2.85县次,以1520年代为界,前期发生频次低,波动小,后期发生频次高,总体年际波动大。明代后期的水灾总县次远多于前期。水灾的空间分布呈现北多南少的分布格局,河流下游多于上游,平原多于山区,水灾多发地主要集中在鄱阳湖平原地区。 展开更多
关键词 明代 水灾 时空特征
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Use of genetic algorithm in new approach to modeling of flood routing 预览
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作者 EL ALAOUI EL FELS Abdelhafi d ALAA Noureddine BACHNOU Ali 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第1期72-78,共7页
The hydrological models and simplifi ed methods of Saint-venant equations are used extensively in hydrological modeling,in particular for the simulation of the flood routing.These models require specifi c and extensiv... The hydrological models and simplifi ed methods of Saint-venant equations are used extensively in hydrological modeling,in particular for the simulation of the flood routing.These models require specifi c and extensive data that usually makes the study of flood propagation an arduous practice.We present in this work a new model,based on a transfer function,this function is a function of parametric probability density,having a physical meaning with respect to the propagation of a hydrological signal.The inversion of the model is carried out by an optimization technique called Genetic Algorithm.It consists of evolving a population of parameters based primarily on genetic recombination operators and natural selection to find the minimum of an objective function that measures the distance between observed and simulated data.The precision of the simulations of the proposed model is compared with the response of the Hayami model and the applicability of the model is tested on a real case,the N’Fis basin river,located in the High Atlas Occidental,which presents elements that appear favorable to the study of the propagation.The results obtained are very satisfactory and the simulation of the proposed model is very close to the response of the Hayami model. 展开更多
关键词 GENETIC Algorithm FLOOD ROUTING Hayami model simulation PROPAGATION
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基于亚像元分析技术的洞庭湖区洪水淹没提取 预览
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作者 张娜 王萍 原晓慧 《北京测绘》 2019年第6期719-723,共5页
遥感成像技术具有成本低、效率高、时效性好等特点,被广泛应用于洪涝灾害监测工作。但受空间分辨率的限制,遥感影像中普遍存在混合像元现象。传统的硬分类方法无法精细化的提取地物信息。本文利用MOD09A1数据,将亚像元分析技术应用于洞... 遥感成像技术具有成本低、效率高、时效性好等特点,被广泛应用于洪涝灾害监测工作。但受空间分辨率的限制,遥感影像中普遍存在混合像元现象。传统的硬分类方法无法精细化的提取地物信息。本文利用MOD09A1数据,将亚像元分析技术应用于洞庭湖区洪水淹没范围提取,提取结果与MNDWI阈值法进行了比较。实验结果表明亚像元分析技术,总体精度高达88.27%,Kappa系数达到0.67,优于MNDWI阈值法,能够实现洪水的精细化提取。 展开更多
关键词 中分辨率成像光谱仪(MODIS) 洞庭湖 亚像元分析 洪水
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基于Sentinel-1B SAR数据的洪水提取和监测 预览
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作者 吴文会 王丽欣 马卓 《测绘与空间地理信息》 2019年第4期110-111,118共3页
洪涝灾害是我国最严重的气象灾害之一,及时准确的洪灾监测是防灾减灾的重要前期工作和基础。本文利用sentinel-1B雷达数据,以黑瞎子岛为研究区,联合使用OSTU阈值分割法和随机森林面向对象分类法针对像素统计单波形、双波形、多波形SAR... 洪涝灾害是我国最严重的气象灾害之一,及时准确的洪灾监测是防灾减灾的重要前期工作和基础。本文利用sentinel-1B雷达数据,以黑瞎子岛为研究区,联合使用OSTU阈值分割法和随机森林面向对象分类法针对像素统计单波形、双波形、多波形SAR影像提取洪水要素,实现对洪灾淹没面积的时序监测,为灾情监测提供数据和技术支撑。 展开更多
关键词 Sentinel-1B SAR 洪水 OSTU阈值分割 随机森林分类
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