نتایج جستجو برای: drainage network

تعداد نتایج: 711450  

Journal: :Scientific Reports 2021

Abstract Stochastic network modeling is often limited by high computational costs to generate a large number of networks enough for meaningful statistical evaluation. In this study, Deep Convolutional Generative Adversarial Networks (DCGANs) were applied quickly reproduce drainage from the already generated samples without repetitive long stochastic model, Gibb’s model. particular, we developed...

Journal: :مدیریت آب و آبیاری 0
میناسادات سیدجواد کارشناس ارشد دانشگاه تهران، پردیس ابوریحان، پاکدشت ، ایران. محمود مشعل دانشیار دانشگاه تهران، پردیس ابوریحان، پاکدشت، ایران

one of the consequences of poor management and operation of irrigation systems, poor water delivery and distribution channels and divisions and consequently improper distribution of water level downstream. the study of simulation and performance evaluation software using hydrodynamic sobek varamin irrigation is done. in order to evaluate the network performance and compare the results of simula...

Due to the rapid urbanization in Iran, different issues have emerged in its major cities such as street flooding, dispersal of dangerous chemicals and flood-related risks due to the lack of a proper drainage network and disorders in the flood channels; and, Mashhad is not exempt from these issues. The aim of this study is to determine the most important parameters affecting (area of impermeable...

2014
Abdulrahman Khalifa Alammar

Introduction. Coronary artery fistulae (CAF) are rare defects with abnormal communication between a coronary artery with either a cardiac chamber or another vascular structure, bypassing the myocardial capillary network. We report a rare multiple arterial coronary fistulae with drainage to the right pulmonary artery. Case Presentation. A 56-year-old male was brought to our hospital for work-up ...

Journal: :تحقیقات آب و خاک ایران 0
حمیده نوری پردیس کشاورزی و منابع طبیعی دانشگاه تهران مونا دیهول کارشناس ارشد آبیاری و زهکشی پردیس کشاورزی و منابع طبیعی دانشگاه تهران مجید وظیفه دوست استادیار گروه مهندسی آب دانشگاه گیلان علی اکبر نوروزی دانش آموخته دکتری گروه خاکشناسی، دانشکده کشاورزی، دانشگاه تربیت مدرس

salinity is a phenomenon that does not satisfy the crop water requirement and leads reduction vegetation. to control of this phenomenon requires appropriate management and monitoring of spatial and temporal salinity variations from the past to the present in this study the spatial and temporal changes of soil salinity of irrigation and drainage network located in garmsar, iran, is investigated ...

2005
Wen-Tzu Lin Wen-Chieh Chou Chao-Yuan Lin Pi-Hui Huang Jing-Shyan Tsai

Automatically extracting drainage networks from digital elevation models coupled with the constant stream threshold value is a regular method. These extracted networks can be verified by comparing the channel initiation points with those from real networks. From the results analysed, the differences in channel initiation points will affect the network geometries, geomorphological indices and hy...

2007
S. Grauso

An application of regression relationships depending on geomorphic parameters is proposed to predict the amount of the average annual suspended sediment yield at different sections of the drainage network. Simple and multiple regression relationships, utilising the drainage density and the hierarchical anomaly index as independent variables, based on data from 20 river basins of different size ...

2003
David Tarboton

This paper describes methods that use digital elevation models (DEMs) in hydrology, implemented as an ArcGIS toolbar using Visual Basic and the ESRI object library. I describe generalized channel network delineation to objectively estimate drainage density and by using terrain curvature accommodate spatially variable drainage density. The multiple flow direction field determined from a DEM also...

2008
Shanshan GE Guoan TANG

Surface runoff is one of dominant factors in hydrological environment, whose spatial pattern and hydrological feature represent the composite factors of its corresponding drainage. And the stream network nodes present spatial structure and attributes of geography and hydrology in a watershed. A quantified method to analyze stream network nodes is proposed in this paper. The typical area of the ...

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