نتایج جستجو برای: lateral erosion of river

تعداد نتایج: 21186963  

2009
Sébastien Détriché Stéphane Rodrigues Jean-Jacques Macaire Philippe Bonté Jean-Gabriel Bréhéret Jean-Paul Bakyono Philippe Jugé

Recent sedimentological and morphological evolution of an island in the River Loire (France) was investigated using the Cs method. This study describes the morphological adjustment of the island in the last 50 years, which corresponds to the increased bed incision of this sandy, multiple-channel environment because of, among other things, the increase in sediment extraction up to 1995. The resu...

Journal: :Remote Sensing 2010
Subhajit Ghoshal L. Allan James Michael B. Singer Rolf Aalto

Hydraulic gold mining in the Sierra Nevada, California (1853–1884) displaced ~1.1 billion m of sediment from upland placer gravels that were deposited along piedmont rivers below dams where floods can remobilize them. This study uses topographic and planimetric data from detailed 1906 topographic maps, 1999 photogrammetric data, and preand post-flood aerial photographs to document historic sedi...

Journal: :Journal of environmental quality 2012
Brian Kronvang Joachim Audet Annette Baattrup-Pedersen Henning S Jensen Søren E Larsen

Phosphorus loss from bank erosion was studied in the catchment of River Odense, a lowland Danish river basin, with the aim of testing the hypothesis of whether stream banks act as major diffuse phosphorus (P) sources at catchment scale. Furthermore, the study aimed at analyzing the impact of different factors influencing bank erosion and P loss such as stream order, anthropogenic disturbances, ...

2003
Beth Pratt-Sitaula Douglas W. Burbank Arjun Heimsath Tank Ojha

In an actively deforming orogen, maintenance of a topographic steady state requires that hillslope erosion, river incision, and rock uplift rates are balanced over timescales of 10–10 years. Over shorter times, < 10 years, hillslope erosion and bedrock river incision rates fluctuate with changes in climate. On 10-year timescales, the Marsyandi River in the central Nepal Himalaya has oscillated ...

Journal: :iranian journal of earth science 0
a.v. gusarov russia, republic of tatarstan, kazan, 420008, kremlevskaya str., 18, kazan university, faculty of geography and ecology

the offered approach is based on the establishment of the functional dependence between river water discharge (q) and suspended ms ,in a number of observations, which noticeably differs from the mean value (r) of subsequent allocated period(s). the earliest period anthropogenic component during the subsequent period(s) is the difference between an actual suspended sediment yield and its hypothe...

2012
Xu-Ming Wang Jie Huo Rui Hao Shi-Feng Cao

A river network is a typical completely open system formed by interconnected river channels. The interactions between the imports of a river (water and sediment) and the channel will cause the change of the channel patterns. This is actually a feedback between the erosion and the sedimentation states of the channel via an adjustment of the sedimentcarrying capability of the stream. This feedbac...

Journal: :iranian journal of otorhinolaryngology 0
mehrdad rogha department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran. sayyed mostafa hashemi department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran. farhad mokhtarinejad department of otorhinolaryngology, loghman hospital, shahid beheshti university of medical sciences, isfahan, iran. afrooz eshaghian department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran. alireza dadgostar department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran.

introduction: cholesteatoma is traditionally diagnosed by otoscopic examination and treated by surgery. the necessity for imaging in an uncomplicated case is controversial. this study was planned to investigate the usefulness of a preoperative high-resolution computed tomography (hrct) scan in depicting the status of middle ear structures in the presence of cholesteatoma and also to compare the...

2015
Sean F. Gallen Frank J. Pazzaglia Karl W. Wegmann Joel L. Pederson Thomas W. Gardner

Incision rates derived from river terraces are commonly used to infer rock uplift rates; however, an apparent dependence of incision rate on measured time interval may confound directly relating incision to uplift. The time-dependent incision rates are a Sadler effect that have been argued to result from a stochastic distribution of hiatal intervals in river incision, potentially reducing the u...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391

in this study, scour of mashkid bridge pier located in mashkid river of saravan county has been studied and to measure the scour rate, the numerical model hec-ras 4.0 has been used. upon selection of mashkid river as the case study and whereas the studied zone is important with respect to the climatic conditions and showery monsoon raining and flowing the great and destructive floodwaters, ther...

2013
Matthias Bernet

The Isère River system drains parts of the Western Alps in south-eastern France. Zircon fission-track data of the Isère River and its tributaries show a range of apparent cooling ages from about 7 to 150 Ma. Zircons with Jurassic to early Tertiary cooling ages are derived from partially reset or non-reset sedimentary cover units of the internal and external Alps, while grains belonging to the m...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید