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Hydrologic modeling of the Upper Suriname River basin using WetSpa and ArcView GIS
Geographic Information Systems Hydrologic modeling
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2015/8/11
A grid-based distributed hydrological model WetSpa, compatible with ArcView GeographicInformation Systems (GIS), was applied to the 7,860 km2 Upper Suriname River basin. Modelparameters were derived f...
Selection of Site for Small Hydel Using GIS in the Himalayan Region of India
Sub-watershed Remote Sensing Geographic Information System
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2015/8/11
The choice of site for small hydro in the inaccessible tracts of Himalayan region is a difficult task by the conventional methods. This leads to a considerable loss of time and money in selecting a pr...
Watershed Physiography, Land Use, and Sediment Yield: A Case Study from Northwest Arkansas, USA
Reservoir Sedimentation Watershed Sediment yield Land use Slope
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2015/8/11
Precision echo sounder surveys of bathymetry and sediment thickness of Lee Creek Reservoir and Lake Shepherd Springs (northwest Arkansas) were combined with Geographic Information Systems (GIS) analys...
ENGAGING THE APPLICATIONS COMMUNITY OF THE FUTURE SURFACE WATER AND OCEAN TOPOGRAPHY (SWOT) MISSION
Applications Hydrology Oceanography
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2015/5/7
NASA and the French space agency, CNES, with contributions from the Canadian Space Agency (CSA) and United Kingdom Space Agency (UKSA) are developing new wide swath altimetry technology that will co...
How to reach a compromise solution on technical and non-structural flood control measures
agreement averaging operator consensus environmental decision making flood risk management fuzzy uncertainty multi-aspect decision
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2015/3/10
Harmful impacts of floods are the result of an interaction between extreme hydrological events and environmental, social, and economic processes. Flood management should consider many diverse aspects ...
Annual changes in the chemical composition of stream water in small catchments with different land-use (Carpathian Foothills, Poland)
river water chemistry water pollution nutrient compounds flow tendency
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2015/2/4
The aim of the study was to identify the factors that influence annual changes in the chemical composition of stream waters. The research area was located in the marginal zone of the Carpathian Foothi...
Improving overland flow routing by incorporating ancillary road data into Digital Elevation Models
Watershed Delineation Road
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2015/1/4
Roads, ditches, and culverts influence hydrological and geomorphological processes significantly. However, most hydrological models continue to rely solely on regional digital elevation models (DEMs) ...
AQUIFER GEOMETRY, BASEMENT-TOPOGRAPHY AND GROUND WATER QUALITY AROUND KEN GRABEN, INDIA
DEM Basement topography Remote Sensing GIS Aquifer geometry
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2014/11/12
In this study a systematic approach has been made for the analysis of Ken graben area by
integrating the remote sensing data with the hydrologic data to study the subsurface
geological and geomorph...
以实例方式剖析了供水建设项目的社会稳定风险，重点从合法性、合理性、可行性、可控性几个方面提出建设
项目可能存在的社会稳定风险因素，并对各风险因素进行分析、识别与估计，预判建设项目的社会稳定风险程度。
小城镇安全供水实时监控模型建立及其应用
小城镇 安全供水针对由多水源 多供水系统
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2015/9/14
害分析与关键控制点(HACCP)理念,建立了供水关键节点实时控制数学模型。该数学模型将供水系统关键部位的
水量、水压、水质等实时数据作为输入数据,与供水系统设计值和国家标准确定的正常范围值进行比较和赋值。当
模型中供水系统赋值求和为/00时,表示关键部位正常,当赋值大于或等于/10时,则相应关键部位报警。模型实例
应用结果表明,该模型可以降低小城镇供水系统在供水生产、加工、输送过程中的风险,...
针对某填海软基处理工程软基处理方法与现场监测项目,对堆载预压法加固处理淤泥软基的表层沉降、分层
沉降、孔隙水压力等监测成果及加固效果进行了分析,结果发现,堆载施工期沉降约占总沉降的65%,加荷间歇期
沉降随时间近似呈线性增加;满载预压期沉降约占总沉降的35%,沉降随时间近似呈抛物线增加。从分层来看,表
层6m淤泥层沉降占总沉降比例平均值为53.9%,是沉降发生的主要部分,而淤泥层下卧层沉降占...
汉江上游郧县五峰段史前大洪水水文学恢复研究
古洪水水文学 HEC-RAS模型 汉江上游 全新世
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2014/1/9
通过深入的野外考察，在汉江上游郧县五峰段多个地点发现全新世古洪水事件的沉积学记录，为恢复史前特大洪水事件的洪峰水位和洪峰流量提供了物质基础。在系统获取河道水文参数的基础上，采用ArcGIS 耦合HEC-RAS模型，推算出其洪峰流量介于42 220~63 400m3/s 之间。对于河槽糙率的灵敏度检验表明，给定糙率变化±25%，模型模拟得到的洪峰流量误差在-10.6%~6.3%之间。这个误差范围远小...
非线性函数参数的线性化率定方法
非线性函数参数 局部极优值 线性化率定 两步循环
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2014/5/15
非线性函数参数率定基本上都是以误差平方和目标函数为信息依据的,其过程通常包括误差平方和目标函数构建和一阶函数求导为零得其参数优值解这两步操作。本文通过研究发现以上两步操作给非线性函数参数增加了不相关的局部极优值,提出了非线性函数参数的线性化率定方法。该方法对非线性函数以参数为自变量求导,再通过导函数差分线性化,并对线性化的参数用误差平方和目标函数进行率定,然后逐步迫近非线性函数参数的最优值。本文在...
A summer climate regime over Europe modulated by the North Atlantic Oscillation
summer climate regime Europe modulated
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2011/1/7
Recent summer heat waves in Europe were found to be preceded by precipitation deficits in winter. Numerical studies suggest that these phenomena are dynamically linked by land-atmosphere interactions...