نتایج جستجو برای: increases the runoff

تعداد نتایج: 16077051  

2017
Yuyan Zhou Jun Xu Weihua Xiao Jianhua Wang Ya Huang Heng Yang

Climate change is expected to have stronger effects on water resources in higher latitude regions. Despite intensive research on possible hydrological responses in those regions to a warmer environment, our knowledge on erosion and sediment yield induced by the climate change in high-latitude headwaters is still limited. In this study, we estimated suspended sediment yields from 2021 to 2050 in...

ژورنال: علوم آب و خاک 2012
علیرضا واعظی, , محمد عباسی, ,

The Soil Conservation Service Curve Number (SCS-CN) method is widely used for predicting direct runoff from rainfall events. The ratio of initial abstraction (λ=Ia/S) to maximum potential retention (S) was assumed in its original development to be equal to 0.2 (λ=Ia/S=0.2) in SCS-CN method. Application of the initial abstraction ratio equal to 0.2 out of the area where it has been developed may...

2011
S. N. Gosling R. G. Taylor N. W. Arnell M. C. Todd

We present a comparative analysis of projected impacts of climate change on river runoff from two types of distributed hydrological model, a global hydrological model (GHM) and catchment-scale hydrological models (CHM). Analyses are conducted for six catchments that are global in coverage and feature strong contrasts in spatial scale as well as climatic and developmental conditions. These inclu...

Journal: :international journal of civil engineering 0
m. karamouz school of civil engineering, university of tehran, tehran, iran m. fallahi school of civil engineering., amirkabir university of tech., tehran, iran s. nazif school of civil engineering, university of tehran, tehran, iran m. rahimi farahani school of civil engineering., amirkabir university of tech., tehran

runoff simulation is a vital issue in water resource planning and management. various models with different levels of accuracy and precision are developed for this purpose considering various prediction time scales. in this paper, two models of ihacres (identification of unit hydrographs and component flows from rainfall, evaporation and streamflow data) and ann (artificial neural network) mode...

Because in Iran, flood phenomenon has the highest financial losses and death tolls among the natural disasters, thus reducing the damage caused by it has been considered for a long time and it is regarded essential. The most urgent action to deal with this natural disaster is to make preparations and take measures to reduce its harmful effects. One of the basic measures in this regard is the re...

2012
K. X. Soulis

The Soil Conservation Service Curve Number (SCS-CN) approach is widely used as a simple method for predicting direct runoff volume for a given rainfall event. The CN parameter values corresponding to various soil, land cover, and land management conditions can be selected from tables, but it is preferable to estimate the CN value from measured rainfall-runoff data if available. However, previou...

2017
Paul J A Withers Robin A Hodgkinson Alison Rollett Chris Dyer Rachael Dils Adrian L Collins Paul E Bilsborrow Geoff Bailey Roger Sylvester-Bradley

Soil phosphorus (P) fertility arising from historic P inputs is a major driver of P mobilisation in agricultural runoff and increases the risk of aquatic eutrophication. To determine the environmental benefit of lowering soil P fertility, a meta-analysis of the relationship between soil test P (measured as Olsen-P) and P concentrations in agricultural drainflow and surface runoff in mostly UK s...

The control of runoff and soil erosion is one of main issues around the world. Therefore, the application of soil amendments is essential in protect water and soil. On the other hand, increasing the sludge production from factories is one of environmental problems that there are methods for beneficial from sludge production including convert them to Biochar. Therefore, the present study was con...

2011
Jestinos Mzezewa Leon D van Rensburg

Runoff constitutes one of the major water losses from agricultural fields in semi-arid areas. However, by adopting appropriate soil management practices, the runoff can be harnessed for improving crop yields. The main objective of this study was to quantify rainfall-runoff relationships under in-field rainwater harvesting (IRWH) using simulated rainfall, and to compare these results to those ob...

ژورنال: علوم آب و خاک 2008
امیر پور رباط, مهدی , ایوبی, شمس الله , جلالیان, احمد , قربانی, بهزاد ,

  Soil erosion is one of the most threatening issues for crop production and environmental qualities, especially for soil and water resources. Appropriate knowledge about total soil loss and runoff is valuable in order to perform soil and water conservation practices in watersheds. EUROSEM, "a single event, dynamic and distributed model," was developed to simulate soil loss, sediment transporta...

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