نتایج جستجو برای: watershed siahroud

تعداد نتایج: 16408  

2010
T. Reshma K. Sundara Kumar

The Muskingum-Cunge flood routing procedure has been incorporated into the Natural Resources Conservation Service Technical Release 20 (TR-20) hydrologic model. The TR-20 model is an event watershed hydrologic model used to analyze impacts of watershed changes (land use, reservoir construction, channel modification, etc) on volume of runoff and peak discharge. Rainfall runoff modeling is very i...

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Journal: :Environmental management 2003
Geoffrey Habron

Recent findings in the Umpqua River Basin in southwestern Oregon illustrate a tension in the rise of both community-based and watershed-based approaches to aquatic resource management. While community-based institutions such as watershed councils offer relief from the government control landowners dislike, community-based approaches impinge on landowners' strong belief in independence and priva...

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2006
D. D.

watershed scale irnpact. Our objective was to estimate the watershed scale impact of grass buEers by comparing sediment and agichemical losses from two adjacent 14 1 165 hectare watersheds, one with conservation buffers and one without. Rainfall derived m o f f events frorn 2002-2003 were monitored for water runoff, TSS, phosphorous and atrazine loss. A conservation-watershed included 0.8 Ism o...

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Journal: :Stroke 2002
Oda-Christina Suter Thanomphone Sunthorn Rudolf Kraftsik Joel Straubel Pushpa Darekar Kamel Khalili Judith Miklossy

BACKGROUND AND PURPOSE The watershed cortical areas are the first to be deprived of sufficient blood flow in the event of cerebral hypoperfusion and will be the sites of watershed microinfarcts. Cerebral hypoperfusion is associated with Alzheimer disease (AD), but information regarding the occurrence of watershed cortical infarcts in AD is lacking. METHODS Brains of 184 autopsy cases (105 def...

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2014
Erhui Li Xingmin Mu Guangju Zhao Peng Gao Hongbo Shao

Precipitation is very important to the formation of runoff, and studying of runoff variation and its response to precipitation has practical significance to sustainable utilization of water resources. The study used Mann-Kendall test, anomaly accumulation method, and precipitation elasticity of runoff method to analyze the changes in the relation of precipitation and runoff and the contribution...

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Journal: :Discrete Applied Mathematics 2005
Laurent Najman Michel Couprie Gilles Bertrand

In this paper, we investigate the links between the flooding paradigm and the topological watershed. Guided by the analysis of a classical flooding algorithm, we present several notions that lead us to a better understanding of the watershed: minima extension, mosaic, pass value and separation. We first make a detailed examination of the effectiveness of the divide set produced by watershed alg...

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Journal: :IEEE Trans. Circuits Syst. Video Techn. 2003
Shao-Yi Chien Yu-Wen Huang Liang-Gee Chen

Watershed transform is a key operator in video segmentation algorithms. However, the computation load of watershed transform is too large for real-time applications. In this paper, a new fast watershed algorithm, named P-Watershed, for image sequence segmentation is proposed. By utilizing the temporal coherence property of the video signal, this algorithm updates watersheds instead of searching...

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Journal: :Environmental monitoring and assessment 2007
J S Kahl S J Nelson I Fernandez T Haines S Norton G B Wiersma G Jacobson A Amirbahman K Johnson M Schauffler L Rustad K Tonnessen R Lent M Bank J Elvir J Eckhoff H Caron P Ruck J Parker J Campbell D Manski R Breen K Sheehan A Grygo

This paper is an overview of this special issue devoted to watershed research in Acadia National Park (Acadia NP). The papers address components of an integrated research program on two upland watersheds at Acadia NP, USA (44 degrees 20' N latitude; 68 degrees 15' E longitude). These watersheds were instrumented in 1998 to provide a long-term foundation for regional ecological and watershed res...

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2010
Rong Zeng Yanwei Zhao Zhifeng Yang

The shrinking Baiyangdian Lake and drying up rivers are widely observed in recent years. Due to the significant advantages in integrated analyses of natural and economic systems, emergy analysis is introduced in this paper to assess the health status of Baiyangdian Watershed. First, we establish a emergy based conceptual framework for the assessment, delineate an emergy flow diagram of Baiyangd...

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Journal: :Tree physiology 2008
Joshua M Halman Paul G Schaberg Gary J Hawley Christopher Eagar

In fall (November 2005) and winter (February 2006), we collected current-year foliage of native red spruce (Picea rubens Sarg.) growing in a reference watershed and in a watershed treated in 1999 with wollastonite (CaSiO(3), a slow-release calcium source) to simulate preindustrial soil calcium concentrations (Ca-addition watershed) at the Hubbard Brook Experimental Forest (Thornton, NH). We ana...

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