نتایج جستجو برای: watershed basin

تعداد نتایج: 71397  

2017
Mary M Peacock Evon R Hekkala Veronica S Kirchoff Lisa G Heki

Currently one small, native population of the culturally and ecologically important Lahontan cutthroat trout (Oncorhynchus clarkii henshawi, LCT, Federally listed) remains in the Truckee River watershed of northwestern Nevada and northeastern California. The majority of populations in this watershed were extirpated in the 1940s due to invasive species, overharvest, anthropogenic water consumpti...

Journal: :محیط شناسی 0
علیرضا کرکوتی دانشجوی کارشناسی ارشد مهندسی عمران – محیط زیست، دانشکده محیط زیست دانشگاه تهران مهرداد نظریها استادیار گروه مدیریت سوانح طبیعی دانشکده محیط زیست دانشگاه تهران اکبر باغوند استادیار گروه مهندسی محیط زیست دانشکده محیط زیست دانشگاه تهران بابک جعفری سلیم دانشجوی کارشناسی ارشد مهندسی عمران – محیط زیست، دانشکده محیط زیست دانشگاه تهران عبدالرضا کرباسی استادیار گروه مهندسی محیط زیست، دانشکده محیط زیست دانشگاه تهران علی وثوق دانشجوی کارشناسی ارشد مهندسی عمران – محیط زیست، دانشکده محیط زیست دانشگاه تهران

computing or determining the amount of maximum flood debit in watershed is one of the main important parts of hydrological research in river improvement. in this regard it is necessary to be distinguished peak of flood flow and its hydrograph for favorable return period. this needs to have long time statistic and leminograph tools in study research area. in this study with the comparison of ava...

2008
Thomas P. Hollenhorst Terry N. Brown Lucinda B. Johnson Jan J.H. Ciborowski George E. Host

Watersheds represent spatially explicit areas within which terrestrial stressors can be quantified and linked to measures of aquatic ecosystem condition. We delineated thousands of Great Lakes watersheds using previously proven and new watershed delineation techniques. These were used to provide summaries for a variety of anthropogenic stressors within the Great Lakes. All delineation technique...

سیف اله امین, , عبدالمجید غفوری روز بهانی, ,

Prediction of watershed responses and simulation of runoff rate and volume are required for design purposes in most water resources projects. For this purpose, different hydrologic methods and events based on continuous hydrologic mathematical models are applied. In this research, a continuous hydrologic model, Stanford Watershed Model-IV (SWM-IV) is used for simulation of annual and monthly vo...

  Erosion is a surface-leveling phenomenon where thetransportof sediments from being washed off the land or by the force of gravity move from elevated areas. During different periods, in Iran, constantly flowing water has been affected by erosion. Thus it is important to address the erosionproblem. This research attempts to assess and identify the parameters affecting erosion in Haji Abad Wa...

Journal: :تحقیقات اقتصاد و توسعه کشاورزی ایران 0
خدیجه مهردوست دانشجوی کارشناسی ارشد توسعۀ روستایی دانشگاه زنجان علی شمس استادیار ترویج کشاورزی و توسعۀ روستایی دانشگاه زنجان اسماعیل کرمی دهکردی استادیار ترویج کشاورزی و توسعۀ روستایی دانشگاه زنجان

the purpose of this descriptive-correlation study was to investigate effective factors on rural people participation in watershed management projects in dorod faraman & lalabad basin, kermanshah province. both qualitative and quantitative paradigms were considered in the study. the target population in quantitative section consisted all rural peoples in the dorod faraman & lalabad basin village...

Journal: Desert 2017

Hydrological processes and their spatial distribution directly are relevant to climate, topography, geology, and land use in the watershed. Therefore, use of a model whit integrity and high performance for simulating the process in deferent watersheds is very important. In this study was assessment performance of semi-distributed SWAT model in simulating hydrology processes in three watersheds ...

2013
D. Napoleon

Image processing is a computational method for various reconstructing process used in the images. Segmentation refers to the procedure of splitting a digital image into many segments. Medical imaging is the system and development used to create imagery of the human body for clinical purposes or medical science. Image gradient is a function which is used to take information from images. A waters...

Journal: :Journal of environmental quality 2015
Z Que O Seidou R L Droste G Wilkes M Sunohara E Topp D R Lapen

Controlled tile drainage (CTD) can reduce pollutant loading. The Annualized Agricultural Nonpoint Source model (AnnAGNPS version 5.2) was used to examine changes in growing season discharge, sediment, nitrogen, and phosphorus loads due to CTD for a ∼3900-km agriculturally dominated river basin in Ontario, Canada. Two tile drain depth scenarios were examined in detail to mimic tile drainage cont...

2015
Timothy A. Goudge John F. Mustard James W. Head Caleb I. Fassett Sandra M. Wiseman

We present results from geomorphic mapping and visible to near-infrared spectral analyses of the Jezero crater paleolake basin and its associated watershed. The goal of this study is to understand the provenance of the sedimentary deposits within this open-basin lake using a source-to-sink approach. Two fan deposits located within the basin have distinct visible to near-infrared mineralogic sig...

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