نتایج جستجو برای: watershed modeling

تعداد نتایج: 404310  

2003
Leon M. Hermans Giampiero E. G. Beroggi Daniel P. Loucks

Currently economic growth in a New York City watershed is limited due to phosphorus concentrations exceeding standards. The phosphorus concentration in the Cannonsville reservoir in New York State must be reduced to safeguard New York City’s drinking water supply, and to enable economic growth to continue in the reservoir’s watershed. In Delaware County, where the reservoir is located, the prob...

2010
Erin Brooks

The water erosion prediction project (WEPP) model is a physically-based hydrology and erosion model. In recent years, the hydrology prediction within the model has been improved for forest watershed modeling by incorporating shallow lateral flow into watershed runoff prediction. This has greatly improved WEPP’s hydrologic performance on small watersheds with seasonal flows, but the current vers...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده کشاورزی 1392

برآورد سیل ناشی از یک بارش، همواره یکی از مسائل مهم در علم هیدرولوژی بوده است. پیشرفت های علمی اخیر باعث پیدایش و تکامل مدل های هیدرولوژیکی متعددی در زمینه کنترل سیلاب، مدیریت منابع آب، بررسی تغییرات آب و هوایی و بررسی موارد گوناگونی در حوضه های آبخیز شده است. در مطالعه حاضر از نرم افزار wms (watershed modeling system) و تکنیک (gis) ، و مدل هیدرولوژیک (hec-hms) و نیز روش های تحلیل آماری، به مطا...

2013
Prem B. Parajuli Ying Ouyang

Pollution of surface water with harmful chemicals and eutrophication of rivers and lakes with excess nutrients are serious environmental concerns. The U.S. Environmental Protec‐ tion Agency (USEPA) estimated that 53% of the 27% assessed rivers and streams miles and 69% of the 45% assessed lakes, ponds, and reservoirs acreage in the nation are impaired (USEPA, 2010). In Mississippi, 57% of the 5...

Journal: :Remote Sensing 2011
Jojene R. Santillan Meriam Makinano Enrico C. Paringit

Landsat MSS and ETM+ images were analyzed to detect 25-year land-cover change (1976–2001) in the critical Taguibo Watershed in Mindanao Island, Southern Philippines. This watershed has experienced historical modifications of its land-cover due to the presence of logging industries in the 1950s, and continuous deforestation due to illegal logging and slash-and-burn agriculture in the present tim...

2008
James C.Y. Guo

Storm water management models using the kinematic wave (KW) approach require the conversion of a natural watershed to its equivalent rectangular cascading plane. A KW cascading plane is specified by the plane’s area, width and slope. Without on-site calibration, there is no guidance how to translate the irregularity of the natural watershed into a rectangular shape that has equivalent hydrologi...

2012
Wanming Luo Baoping Yan

Environmental monitoring in ecological and hydrological watershed-scale research is an important and promising area of application for wireless sensor networks. This paper presents a system design of IPv6 wireless sensor network (IPv6WSN) in Heihe river watershed in Gansu province of China to assist ecological and hydrological scientists collecting field scientific data in an extremely harsh en...

Journal: :Journal of environmental quality 2015
E John Sadler Kenneth A Sudduth Scott T Drummond Earl D Vories Patrick E Guinan

Knowledge of weather, particularly precipitation, is fundamental to interpreting watershed and hydrologic processes. The long-term weather record in the Goodwater Creek Experimental Watershed (GCEW) complements hydrologic and water quality data in the region. The GCEW also is the core of the Central Mississippi River Basin (CMRB) node of the Long-Term Agroecosystem Research network. Our objecti...

2006
Clifford A. Shaffer Naren Ramakrishnan Layne T. Watson Randy Dymond Vinod Lohani

Effective watershed management requires that decision-makers receive input about, and balance consideration of, a number of competing factors. The fundamental drivers of watershed change are modifications to landuse and settlement patterns. To model the effects of landuse and settlement changes properly requires, at a minimum, the ability to model effects related to surface and subsurface hydro...

Calibration of model is critical for hydrologic modeling of large watersheds in a mountain watershed. In this study Soil and Water Assessment Tool (SWAT) used to comparison a single-site calibration procedure that employed streamflow measurement at outlet of watershed to a multi-site calibration method that used streamflow measurements at three stations (Galinak, Joestan and Dehdar). Results sh...

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