نتایج جستجو برای: surface water run

تعداد نتایج: 1219301  

ژورنال: آبخیزداری ایران 2019

By understanding the temporal and spatial variations of water resources in a region, the better management and planning of water resources and water consumptions can be done. Time series modeling, if used correctly, will lead to acceptable results in this regard. For this purpose, the monthly runoff time series for 28 years was prepared at the hydrometric stations of Mehregerd region and the pr...

2004
Luis C. Timm Julio C. M. de Oliveira Tania T. Tominaga Fabio A. M. Cássaro Klaus Reichardt Osny O. S. Bacchi

The quantification of soil water balance components was conducted in a sugarcane (Saccharum officinarum L.) field differently managed, as well as a qualitative analysis of the methodologies used for their estimation. The study was conducted in randomized block experiment with four replicates and three treatments: bare soil, mulched soil using trash left on the soil surface after harvest, and so...

Journal: :The American naturalist 2002
Johan van de Koppel Max Rietkerk Frank van Langevelde Lalit Kumar Christopher A Klausmeier John M Fryxell John W Hearne Jelte van Andel Nico de Ridder Andrew Skidmore Leo Stroosnijder Herbert H T Prins

Recent theoretical studies have shown that spatial redistribution of surface water may explain the occurrence of patterns of alternating vegetated and degraded patches in semiarid grasslands. These results implied, however, that spatial redistribution processes cannot explain the collapse of production on coarser scales observed in these systems. We present a spatially explicit vegetation model...

Journal: :iranian journal of environmental sciences 0
mashura shammi dept. of environmental sciences jahangirnagar university bikash karmakar department of environmental sciences, jahangirnagar university, dhaka, bangladesh md. mostafizur rahman department of environmental sciences, jahangirnagar university, dhaka, bangladesh faculty of environmental earth science, graduate school of environmental science, hokkaido university, sapporo, japan md saiful islam department of environmental biology and chemistry, graduate school of science and engineering for research, university of toyama, gofuku 3190, toyama 930-8555, japan. rashadur rahaman dept of environmental sciences, jahangirnagar university, savar dhaka bangladesh khabir uddin department of environmental sciences, jahangirnagar university, dhaka, bangladesh

batiaghata upazila, khulna district in south-west coastal region of bangladesh is the mostly saline affected area, where agriculture activities are mainly dependent on rainfall. 23 water samples from surface water and shallow tube well (stw) were collected in the monsoon season and analyzed for physico-chemical properties to classify them according to salinity hazard. electrical conductivity (e...

Journal: :آب و خاک 0
سجاد نظریان علی نجفی نژاد نادر نورا

introduction: given its low and sparse precipitation both in spatial and temporal scales, iran is nestled in an arid and semiarid part of the world. on the other hand, because of population growth, urbanization and the development of agriculture and industry sector is frequently encountered with increasing water demand. the increasing trend of water demand will widen the gap between water suppl...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2015
tahereh poursaberi vahide akbar seyed mohammad reza shoja

a new sorbent composed of 3-aminopropyltriethoxy-silane-coated magnetic nanoparticles, functionalized with rhodium(iii) porphyrin complex was synthesized and characterized by elemental analysis, x-ray diffraction (xrd), transmission electron microscopy (tem), fourier transform infrared spectroscopy (ft-ir) and thermogravimetric analysis (tga). the effect of some co-existing anions present in aq...

Journal: :desert 2011
a.r. keshtkar m. mahdavi a. salajegheh h. ahmadi a. sadoddin

the relative impacts of different types of land use on the surface water quality are yet to be ascertained and quantified. in this paper, the influence of different types of land use on surface water quality is investigated. rain events samples from different land use in the central plateau, iran, were analyzed for major ions. statistical analyses were employed to examine the statistical relati...

Journal: :desert 2012
arash malekian m. mahdavi m. kholghi gh.r. zehtabian m. mohseni saravi

the world is facing severe challenges in meeting the rapidly growing demand for water resources. in addition,irrigation water which is the largest use of water in most developing countries and arid and semi arid regions, will likelyhave to be diverted increasingly to meet the needs of the households in urban areas and industry sectors whilst remaining aprime engine of agricultural growth. a lin...

Journal: :international journal of environmental research 2014
n. pourang a.s. noori

concentrations of six heavy metals including cr, mn, ni, pb, v and zn were determined in topsoil (from 47 grid cells), surface water (4 streams) and groundwater (8 wells and 4 qanats) from an agriculturalarea located at south part of the iranian capital, near the tehran oil refinery. concentrations of the elementswere measured using flame and flameless atomic absorption spectrometry. based on t...

2009
M. A. M. Ibrahim T. K. Emara

Under surface irrigation, particularly in clay soils cut-off technique is considered as one of the most practical way in saving irrigation water that traditional farmers could be easily implemented. Such farming way is processing through find out the optimum length of irrigation run at which watering should be stopped instead of irrigation till the tail end of the furrows or borders. Such proce...

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