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.

Morphological changes of river due to construction of a port at Baan Paeng

Abstract: The purpose of this paper is to analyze fluvial process and evaluate the impact of a port construction on river by using quasi-two-dimensional GSTARS 2.1 that can simulate the lateral change or river bank failure. The study emphasizes the quantitative influence of construction of the port which obstructs or diverts the flow direction. Furthermore, it shows the efficiency and application of the mathematical model on river engineering especially on the cases that have limited data. The selected case study is the project for surveying and the design of a port at the Mekong River, Amphor Baan Paeng, Nakorn Panom Province. The data of 19 river cross-sections, discharge of water, maximum level of water in 2002 and minimum level of water in 1992 with 20 return periods were used. The results show that the port does not severely affects the changing of the thalweg and the bank of the Mekong River at the project location and nearby areas. Moreover, the scouring or failure of river bank was found to be reduced at some river cross-sections.

Determining the stage-discharge curve and changing it into a regression equation using hydraulic software

Abstract: Constant measurement of the rivers flow in normal conditions is difficult and costly and in flood risk condition it is perhaps impossible due to the measurement problems and probable risks. Therefore, in hydrometric stations through continuous reading of the scale and finding the relationship between stage-discharge, the flow rate is obtained for the times when the measurement is not done. Stage-discharge relationship is a kind of flow resistant equation which is used to determine the flow rate when the hydraulic radius or depth, channel shape, slope, bed material characteristics, and temperature are known. The present research was conducted to determine stage –discharge relationship in the Dez River at different stages. First of all, the needed data were collected including cross sections, hydrological data, hydrometric stations data, etc at the Dez River. After collecting the data, the associated hydraulic models were implemented. The models used in this research are HEC-RAS and MIKE11 software which are important software in river engineering sciences.

Evaluation of Impacts from River Engineering Measures at Nanjing Reach of Yangtze River : An Application of Hydrodynamic Modelling and Sediment Transportation Simulations

Abstract: The demand of electric power has rapidly increased in China along with the financial development. High pollution rates have pushed the development towards more renewable energy generating alternati ...

Comparison of flow characteristics in a physical model with 1d, quasi-2d, and 2d numerical models in a river reach

Abstract: Numerical models are being used widely in river engineering projects. However, the reliability of these models, minimum field data requirement, and the optimal computational processes are of major concern. This study compares the simulated steady flow parameters from a well-known numerical models with that of a true river physical model. A fixed-bed model is developed for the Nazloo River, IRAN, with horizontal scale of 1:100 and vertical scale of 1:20. Results from HEC-RAS (1D), BRI-STARS (quasi 2D), and FAST-2D (2D) were compared for corresponding flow parameters under similar initial and boundary conditions. This was made for five different flows in three sub-reaches along the river (i.e. downstream of a bridge, bridge reach, upstream of the bridge). The best adapted results were produced by HEC-RAS. BRI-STARS and FAST-2D models took the next ranks respectively. The averaged predictive errors were rated 1.8, 2.2, and 5.5 percent for water surface elevations and 10.2, 9, and 12.6 percent for mean velocities, respectively. The application of each model is recommended in river projects subject to the inclusion of the degree of certainties provided by the present study.

Spatial and Temporal Estimation of Suspended Sediment Load in Aji-chay River Using Geostatistics and Artificial Neural Network

Abstract: Sediment transport phenomenon in rivers, which has been under the consideration of specialists and water engineers, is one of the complicated problems in river engineering studies. Usually sediment transport and storage that threaten hydraulic structures in rivers are important problems. So presenting new and efficient approaches for accurate estimation of suspended sediment load at different scales will play very important role in river engineering studies. As in most of the sediment gauging stations of the country, sediment sampling is carried out daily and irregularly, if it is needed to know the suspended sediment load in a particular of river, it is necessary to utilize suitable temporal and spacial models. In this study, geostatistics and artificial neural network were used in order to combine time and space series analyses together to present a comprehensive model to estimate monthly suspended sediment load in Aji-chay river. Therefore, rational data has been produced with the aid of artificial neural network at monthly scale, then by both uni and multi-parametric estimators namely kriging and cokriging (in addition to suspended sediment load, water discharge is also used as a secondary variable) methods, monthly suspended sediment load was estimated along the Aji-chay river. Results showed that while both models were valuable in restricted area, the cokriging model in comparison with kriging model was more accurate.