نتایج جستجو برای: catchment hydrodynamics

تعداد نتایج: 37973  

2004
Xiahong Feng James W. Kirchner Colin Neal

Catchment-scale chemical transport is jointly controlled by hydrological and chemical processes. Water may take a complex set of flowpaths underground toward the stream, carrying soluble substances with it. Some chemical constituents are nonreactive; these act as passive tracers, moving with the water. Other constituents react with the porous medium; concentrations of these reactive tracers rev...

Water harvesting is the collection of runoff for productivity purposes, instead of runoff being left to cause erosion. In arid and semi-arid drought-prone areas, micro-catchments are widely used as a water harvesting method to improve rangeland condition. The aim of present study was to investigate the effects of micro-catchment on ecological indices of rangeland health in Ghick-Sheikhha, Jirof...

2002
B. A. Branfireun N. T. Roulet

The fate and transport of methylmercury (MeHg) were studied in a small boreal catchment. Hydrological processes largely govern the magnitude of the flux of MeHg. Seasonal and inter-annual variability in hydrology produce variable source strengths of MeHg throughout the catchment. The mass flux of MeHg within, and from the catchment is dependent on the mass flux of water and the relative placeme...

Journal: :تحقیقات موتور 0
محمد کاظمی m. kazemi تیمور توکلی هشجین t. tavakoli hashjin سیامک علیزاده نیا s. alizadenia غلامحسین نجفی g. najafi

in order to reduce wear in gudgeon pin, bush and piston boss lubrication is done. oil used in national engine species was 10w40 with dynamic viscosity 5.5 mpa.s at 140 °c (the working temperature). in order to complete investigation the oil film hydrodynamics analysis in small end of connecting rod, a real full model engine with four cylinders has been simulated by avl excite5.1 software. in th...

Journal: :Journal of environmental quality 2005
Anna M L Lindahl Jenny Kreuger John Stenström Annemieke I Gärdenäs Ghasem Alavi Stéphanie Roulier Nicholas J Jarvis

The objective of this study was to identify the main sources of variation in pesticide losses at field and catchment scales using the dual permeability model MACRO. Stochastic simulations of the leaching of the herbicide MCPA (4-chloro-2-methylphenoxyacetic acid) were compared with seven years of measured concentrations in a stream draining a small agricultural catchment and one year of measure...

2011
Paul D. Brooks Peter A. Troch Matej Durcik Erika Gallo Melissa Schlegel

[1] Primary productivity and vegetation cover are strongly related to how precipitation is partitioned into surface discharge, storage, and evapotranspiration (ET). Thus, quantifying feedbacks between changes in precipitation and vegetation at regional scales is a critical step toward predicting both carbon balance and water resources as climate and land cover change. We used a catchment-based ...

Journal: :Entropy 2017
Masengo Ilunga

The importance of the mean annual runoff (MAR)-hydrological variable is paramount for catchment planning, development and management. MAR depicts the amount of uncertainty or chaos (implicitly information content) of the catchment. The uncertainty associated with MAR of quaternary catchments (QCs) in the Upper Vaal catchment of South Africa has been quantified through Shannon entropy. As a resu...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید باهنر کرمان - دانشکده کشاورزی 1387

چکیده ندارد.

Journal: :Nuclear Physics B 2005

Journal: :Water Research 2021

Seasonal climate forecasts produce probabilistic predictions of meteorological variables for subsequent months. This provides a potential resource to predict the influence seasonal anomalies on surface water balance in catchments and hydro-thermodynamics related bodies (e.g., lakes or reservoirs). Obtaining impact discharge temperature) requires link between models simulating hydrology lake hyd...

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