Water Structures

عملیاتی عمرانی که سالی یک‌بار توریست‌ها را به رود زرد چین می‌کشاند

شن‌شویی، عملیاتی عمرانی است که هر سال یک بار برای گل‌زدایی (لایروبی) از دریاچه پشت سد است و به خاطر ابعاد غیرقابل تصورش، توریست‌های زیادی را جذب خود می‌کند.

تصویری که می‌بینید، عملیات شن‌شویی سد ذخیره ژیائولنگدی (Xiaolangdi) در استان هنان چین را نشان می‌دهد که روی رود زرد بنا شده است. این سد که ساخت آن ۳.۵ میلیارد دلار آمریکا هزینه برداشته، ۱۵۴متر ارتفاع و ۱۳۱۷ متر عرض دارد و ظرفیت تولید برق آن ۱۸۳۶ مگاوات است.

انباشته شدن گل و لای و رسوبات مختلف در بستر رودخانه عظیم زرد باعث کند شدن جریان آب و بالا آمدن سطح آب می‌شود که هر دو خطر وقوع سیل را افزایش می‌دهند. به همین دلیل، هر سال یک بار مسوولان سد در عملیاتی هماهنگ شده، دریچه‌های اضطراری سد را باز می‌کنند تا جریان شدید آب، گل و لای و رسوبات پایین‌دست رود را بشوید. هر سال بیش از ۳۰ میلیون تن گل و لای به این روش شسته می‌شود و به‌طور متوسط ۲۰۳ سانتی‌متر از ارتفاع بستر رودخانه در پایین‌دست می‌کاهد.

 

نوشته شده توسط Water structures student در Thu 17 Jul 2014 ساعت | لينک ثابت |

Water Structures

نوشته شده توسط Water structures student در Fri 13 Dec 2013 ساعت | لينک ثابت |
HEC-GeoRAS 10.1 for ArcGIS 10.1:  

 

 

 

 

 

 

This package will install HEC-GeoRAS 10.1 and all its pre-requisites automatically. Documentation is available from the programs Help menu

ArcGIS 10.1 (ArcView license) with the 3D Analyst and Spatial Analyst extensions are required

Release Notes: The Animation Tool was not migrated to HEC-GeoRAS 10.1. The native ArcGIS Animation Toolbar must be used

Important note for HEC-GeoHMS 10.1 users
If you previously had HEC-GeoRAS 10.1 installed and want to use HEC-GeoHMS 10.1, you must uninstall the old version of HEC-GeoRAS 10.1 released in Feb 2013 and install the updated setup package below that supports side by side installation with HEC-GeoHMS 10.1

Download HEC-GeoRAS 10.1 [Updated] Install Package  12.7 MB

from: http://www.hec.usace.army.mil

نوشته شده توسط Water structures student در Thu 9 Aug 2012 ساعت | لينک ثابت |
HEC-GeoHMS 10.1 for ArcGIS 10.1:   

This install package will install HEC-GeoHMS 10.1 and all its pre-requisites automatically. Documentation is available from the programs Help menu or at the link below.

ArcGIS 10.1 with the Spatial Analyst extension is required.

Important note for HEC-GeoRAS 10.1 users:
If you are using HEC-GeoRAS 10.1 you must uninstall the old version released in Feb 2013 and install the updated setup package that supports side by side installation with HEC-GeoHMS 10.1.

Download HEC-GeoHMS 10.1 Install Package (42.3 MB)
User's Manual (7.57 MB)

نوشته شده توسط Water structures student در Fri 11 Mar 2011 ساعت | لينک ثابت |
What the past tells us about modern sea-level rise

Researchers from the University of Southampton and the Australian National University report that sea-level rise since the industrial revolution has been fast by natural standards and - at current rates - may reach 80cm above the modern level by 2100 and 2.5 metres by 2200.

The team used geological evidence of the past few million years to derive a background pattern of natural sea-level rise. This was compared with historical tide-gauge and satellite observations of sea-level change for the 'global warming' period, since the industrial revolution. The study, which was funded by the Natural Environment Research Council (iGlass consortium) and Australian Research Council (Laureate Fellowship), is published in the journal Scientific Reports.

Lead author Professor Eelco Rohling, from the Australian National University and formerly of the University of Southampton, says: "Our natural background pattern from geological evidence should not be confused with a model-based prediction. It instead uses data to illustrate how fast sea level might change if only normal, natural processes were at work. There is no speculation about any new mechanisms that might develop due to man-made global warming. Put simply, we consider purely what nature has done before, and therefore could do again."

Co-author Dr Gavin Foster, a Reader in Ocean and Earth Science at the University of Southampton, who is based at the National Oceanography Centre, Southampton (NOCS), explains: "Geological data showed that sea level would likely rise by nine metres or more as the climate system adjusts to today's greenhouse effect. But the timescale for this was unclear. So we studied past rates and timescales of sea-level rise, and used these to determine the natural background pattern."

Co-author Dr Ivan Haigh, lecturer in coastal oceanography at the University of Southampton and also based at NOCS, adds: "Historical observations show a rising sea level from about 1800 as sea water warmed up and melt water from glaciers and ice fields flowed into the oceans. Around 2000, sea level was rising by about three mm per year. That may sound slow, but it produces a significant change over time."

The natural background pattern allowed the team to see whether recent sea-level changes are exceptional or within the normal range, and whether they are faster, equal, or slower than natural changes.

Professor Rohling concludes: "For the first time, we can see that the modern sea-level rise is quite fast by natural standards. Based on our natural background pattern, only about half the observed sea-level rise would be expected.

"Although fast, the observed rise still is (just) within the 'natural range'. While we are within this range, our current understanding of ice-mass loss is adequate. Continued monitoring of future sea-level rise will show if and when it goes outside the natural range. If that happens, then this means that our current understanding falls short, potentially with severe consequences."

نوشته شده توسط Water structures student در Sun 15 Feb 2009 ساعت | لينک ثابت |

مدیر گروه واحد علوم و تحقیقات به عنوان پیشکسوت مهندسی آب شناخته شد.

پروفسور حسين صدقي اولين فرد ايراني است كه دكتراي تخصصي در رشته هيدرولوژي دريافت نموده است و اولین کتاب هیدرولوژی فارسی با عنوان مقدمه ای بر هیدرولوژی توسط این بزرگوار به رشته تحریر در آمده است. ايشان براي  اخذ درجه دكترا در فرانسه تحصيل كرده اند و دوره فرصت مطالعاتي را در آمريكا گذرانده اند و لذا به زبانهاي فرانسه و انگليسي مسلط مي باشند. بدون اغراق ايشان يكي از بهترين هيدرولوژيست هاي دنيا مي باشند و ازمفاخر علمي ايران زمين و از چهره هاي ماندگار علمي به حساب مي آيند. ايشان علاوه بر مقام والاي علمي از نظر اخلاقي نيز در مرتبه اي بسيار بالا و بي نظير قرار دارند و يك معلم اخلاق واقعي مي باشند. حسن خلق، متانت، صبر، فروتني، برخورد بسيار محترمانه با ديگران در كنار سطح علمي بالا، از ايشان انساني بسيار دوست داشتني ساخته است. براي ايشان طول عمر با عزت از درگاه پروردگارخواستاریم. ايشان داراي یک پايگاه اينترنتي شخصي مي باشند. آدرس پايگاه علمي ايشان به شرح زير است:

http://www.hsedghi.blogfa.com

ايشان همچنين يك پايگاه اينترنتي ادبي نيز دارند كه آدرس آن به شرح زير مي باشد:

http://www.hosedghi.blogfa.com

نوشته شده توسط Water structures student در Sun 15 Feb 2009 ساعت | لينک ثابت |

This text integrates a wide range of research and tidal resource theory and data to present a detailed analysis of the physics and oceanography of tidal stream power devices together with a world wide resource analysis. Clearly structured throughout the book is divided into two distinct parts

Part One provides the theoretical background to the subject and deals with the historical development of the harmonic method for the synthesis of tidal currents; the principles of fluid and tidal flow and the principles of device ducts, turbines and electrical systems. A review and analysis of more than forty tidal stream power proposals is also discussed

Part Two provides a comprehensive overview of current practice. The economic modelling of tidal stream power installations is covered with more than three hundred current meter records from around the world used to analyse the potential and cost of tidal stream power on a global basis

Hallmark Features

  • reviews the tidal resources around the world
  • complete analysis of tidal stream power systems
  • includes historical information on tidal science and biographical information on major figures
  • concentrates on engineering physical geography rather than engineering specifics
  • includes a website with a wide range of computer models, data and simulations
نوشته شده توسط Water structures student در Tue 16 Dec 2008 ساعت | لينک ثابت |

برترین های نشریات ISI  از لحاظ Impact Factor در موضوعات آب ، سازه هیدرولیکی ، سواحل و سازه های دریایی ، هیدرولیک و هیدرولوژی

ACI structural journal  

نوشته شده توسط Water structures student در Tue 16 Sep 2008 ساعت | لينک ثابت |

Data-driven tools cast geographical patterns of rainfall extremes in new light


The globe shows rainfall values and represents research focused on global climate change while the India map shows the spatial variability of rainfall extremes.

Using statistical analysis methods to examine rainfall extremes in India, a team of researchers has made a discovery that resolves an ongoing debate in published findings and offers new insights. The study, initiated by Auroop Ganguly and colleagues at Oak Ridge National Laboratory, reports no evidence for uniformly increasing trends in rainfall extremes averaged over the entire Indian region.

It does, however, find a steady and significant increase in the spatial variability of rainfall extremes over the region.

These findings, published in Nature Climate Change, are contrary to results of some earlier work on this subject. The new study uses statistical methods designed explicitly for modeling extreme values and associated uncertainties.

"Our research suggests that one needs to be aware of the different characterizations of extremes and that these characterizations require both interpretability and statistical rigor," said Ganguly, now a faculty member at Northeastern University in Boston.

Ganguly and co-authors Subimal Ghosh (Indian Institute of Technology Bombay, Debasish Das (Temple University) and Shih-Chieh Kao (ORNL) used their statistical methodologies to analyze data from 1,803 stations from 1951 to 2003. This information was provided in 1-by-1-degree spatial grids by the India Meteorological Department.

The research team noted that statistical observations offer complementary insights compared to the current generation of physics-based computational models. This is especially the case if the goal is to understand climate and rainfall variability at local to regional scales.

Understanding climate model-simulated trends of precipitation extremes and developing metrics relevant for water resources decisions were the focus of a paper published earlier this year in the Journal of Geophysical Research.

In that paper, Ganguly and co-author Kao showed that while models provide relatively credible predictive insights of precipitation extremes at aggregate spatial scales, the uncertainty begins to increase significantly at localized spatial scales - especially over the tropical regions.

"Even as higher resolution models are attempting to get to the stage where spatially explicit insights can be generated, the kind of insights generated from observations in this study can be used as methods for model diagnostics and can help address science gaps," Kao said.

Ganguly noted that the Nature Climate Change paper, titled "Lack of uniform trends but increasing spatial variability in observed Indian rainfall extremes," is the result of a team effort with researchers from diverse disciplines.

Ghosh, the first author, is a hydro-climate scientist and civil engineer; Das is a graduate student in computer science and data mining; Kao is a statistical who specializes in water availability and flood frequency analysis; and Ganguly, a civil engineer, specializes in climate extremes and water sustainability as well as data sciences for complex systems.

This research concept was initiated when all the authors were working with Ganguly at ORNL and was funded by the Laboratory Directed Research and Development program. The National Science Foundation's Expeditions in Computing program and the Department of Science and Technology of India also provided funding.

نوشته شده توسط Water structures student در Thu 14 Aug 2008 ساعت | لينک ثابت |

COMS

Calendar of upcoming scientific conferences

Browse by subject

http://canalcool.blogfa.com/page/conferences.aspx

نوشته شده توسط Water structures student در Wed 16 Jul 2008 ساعت | لينک ثابت |

ASCE News: February 2011

John Wiley & Sons, Inc

 WILEY - KNOWLEDGE FOR GENERATIONS

 

نوشته شده توسط Water structures student در Wed 7 May 2008 ساعت | لينک ثابت |
************ * Cover shot of Journal of Hydrology * ************

 
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Powered By mohamad reza hamrang- water structures student - email : canalcool@yahoo.com - و تشکر از مدير گروه محترم استاد دکتر صدقي با حمايت دانشجويان گروه آبياري علوم تحقيقات تهران english version