Topic
River engineering
About: River engineering is a research topic. Over the lifetime, 435 publications have been published within this topic receiving 10286 citations. The topic is also known as: Channelisation.
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TL;DR: In this article, a model that relates stream temperature with riparian vegetation was developed, showing that river water temperature is more sensitive to river discharge change in the case of low density condition.
Abstract: Recently, multiple functions of river riparian vegetation are attracted in biological, environmental river engineering field. The decline of riparian vegetation strongly affects the river thermal environment, which also has a large impact on the ecological systems. In this study, a model that relates stream temperature with riparian vegetation was developed. The Nam Song River, which is a tributary of the Nam Ngum River flowing through the Vientiane Metropolis, was selected for field study. Meteorological data (air temperature, relative humidity, wind speed) were used, and the sink or source terms of the heat transfer equation were estimated from that data. NDVI (normalized difference of the vegetation index) remote sensing data was used for estimation of LAI (leaf area index) seasonal change. Simulations were made with several cases of riparian vegetation density, showing that river water temperature is more sensitive to river discharge change in the case of low density condition.
TL;DR: In this paper, the impact that the awareness of the nonstationarity of hydrological phenomena, and of river hydrology in particular, has on hydraulic engineering and hydropower is discussed.
Abstract: The current theme is the impact that the awareness of the non-stationarity of hydrological phenomena, and of river hydrology in particular, has on hydraulic engineering and hydropower [...]
25 Sep 2012
TL;DR: In this paper, the minimum rate of available energy dissipation was used in the river regulation projects to elucidate the mechanism of a river bed's self-adjustment under a given boundary and amount of water and sediment.
Abstract: To elucidate the mechanism of a river bed's self-adjustment under a given boundary and amount of water and sediment, the principle and formula of minimum rate of available energy dissipation were put forward in the river regulation projects. This was according to the theory of entropy and energy dissipation about dynamic equilibrium stability of an irreversible process in a fluvial river. The formula is applied to the river regulation of the Han River in the middle of China for predicting its regulated parameters. The comparisons between the computed and measured navigable depths and width show that the formula is effective. The result of the present work implied that the theory used in the regulation projects can provide engineers the needed theoretical basis for river morphology and river engineering studies.
01 Jan 2005
TL;DR: In this article, a pre-developed software named Gslib was used and then estimation of the suspended load of Talkherood River was carried out by both Kriging and Cokriging methods.
Abstract: Due to the importance of sediment hydraulics in river engineering and its effects on hydraulics structures, the reliable estimation of the suspended sediment load plays very important role in real and reliable study. Because of some shortages such as technical and economical problems, the data from many sediment- gauging stations in national rivers can not be relied on. Rational data is therefore necessary for some reaches. In this study, geostatistics and concepts of spatial variables were used in order to find a model for estimation of Talkherood suspended sediment load. For this purpose, a pre-developed software named "Gslib" was used and then estimation of the suspended load of Talkherood River was carried out by both Kriging and Cokriging methods. In Cokriging method, in addition to suspended load, water discharge is also used as a secondary variable. This variable has a statistical relation with suspended load. River is the most important river in the northern-west of Iran. In this study, the data of 5 hydrographic stations were used for suspended load estimation of Talkherood using both Kriging and Cokriging methods. For verification of the presented model, cross validation method was used. The result showed that proposed model could be adequately used for estimation of Talkherood suspended load. Two important points raised from the obtained results are as follows: Gaussian Variogram model for spatial estimation of Talkherood suspended sediment load has the best fitting on the experimental Variograms and the result of Cokriging method, in which the discharge is used as a secondary and parameter and compared to the Kriging method.
01 Jan 2006
TL;DR: In this paper, a method to compute the location and depth of tension crack is presented, and the sensitivity of safety factor of river banks against planar failure via the variation of some important parameters affecting the bank stability has been investigated.
Abstract: The erosion of channel banks causes damages to fertile agricultural land and the infrastructures located near destabilized river banks, leads to channel widening. So, the stability analysis of river bank is an important issue in river engineering problems. There are many factors have to be considered on the bank stability analysis; i.e. bank geometry, bank material properties, the level of water surface in the river and at the ground, and so on. Among the bank geometry parameters, the location and the depth of tension crack are two essential issues for determining bank geometry and the amount of river bank erosion and sedimentation. However, there are a few researches in literacy on computing these parameters and their effects on bank stability. in this research, a method to compute the location and depth of tension crack is presented. the sensitivity of safety factor of river banks against planar failure via the variation of some important parameters affecting the bank stability has been investigated. in this regard 51 sites of Mississippi river, USA, have been analyzed with a new model called “Extensive Model of Stability Analysis of Riverbanks (EMSAR)”. on the basis of the results of bank stability analysis for available data, it is found that the bank angle, cohesion and the specific weight of bank material, in importance order, are the most important parameters affecting bank stability and the amount of safety factor against bank failure. the results also show that the depth of tension crack has a little influence on the safety factor of bank stability so that in the case of 20% error on estimating both the depth of tension crack and the river bank angle, there is 4% and 25% error on the amount of corresponded safety factors, demonstrating low and high sensitivity of safety factor over the variation of depth of tension crack and the bank angle, respectively.