scour modeling piles of kambuzia industrial city bridge using hec-ras and artificial neural network
today, scouring is one of the important topics in the river and coastal engineering so that the most destruction in the bridges is occurred due to this phenomenon. whereas the bridges are assumed as the most important connecting structures in the communications roads in the country and their importance is doubled while floodwater, thus exact design and maintenance thereof is very crucial. for this purpose, the exact design has a substantial effect. therefore, the initial data of design should have the required and acceptable accuracy, at the meanwhile the scour depth is very important for the bridge piers so that the précised estimation of this depth increases the life time of operation and reduces the maintenance costs. in this study, scour of bridge pier at the entrance of kambuzia industrial area of zahedan has been discussed and investigated as a case study. for this purpose, hydraulic structures analysis software (hec-ras) has been used for bridge scour modeling. the summary of results indicates the depth 3.21m of scour for the piers of this bridge. as well as, establishment of hydraulic barriers such as gabion walls as a strategy for reduction of scour depth has been studied. the summary of modeling these barriers aiding hec-ras shows the effectiveness of this subject on the reduction of bridge’s scour depth, so that upon making these barriers in the bridge upstream, the scour depth has been reduced more than 25%. in continue, to present a useful method for estimation of scour depth, artificial neural network intelligent systems (ann) has been used. to evaluate the function of the mentioned method, the data resulted from analysis of studied bridge scour by hec-ras software has been used in four modes including raw, normalized, dimensionless and normalized dimensionless. after determination of the best structure for each one of these modes, for extendibility and ensuring from results of this method, a series of prototypes have been used to test the networks. the summary demonstrates the appropriate efficiency of this method in prediction of bridges scour depth. the results of this research show that normalization and dimensionless-making of data used in the neural networks causes the improvement of these networks’ function in prediction of the maximum scour depth comparing to the raw data mode.
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...
one of the important issues in hydraulic engineering is inspection of local scour depth around bridge pier. using piles is one of the ways for confronting local scour and erosion. in this study, the experiments were conducted in an 8m long, 0.5m deep and 0.25m wide flume. and the effectof using piles and number of them observed on the amount of scour in three different frude numbers. the shape ...متن کامل
a comparative study of artificial neural network and hec-hms1 model in rainfall-run off estimation in azam river basin of herat
abstract one of the techniques that has been used in different areas of sciences, and probably would be able to simulate complicated process of rainfall-run off is artificial neural network (ann). the purpose of this research is to evaluate the applicability of ann in rainfall- run off simulation and the comparison of the results to those produced by hec-hms model in azam river basin of herat i...متن کامل
The Effect of Submergence Percentage of the Submerged Piles on the Reduction of Scour in Bridge Abutments
Scour around hydraulic structures is an inevitable phenomenon . Recognition of this phenomenon and dealing with it is an issue considering which will ensure the project success . Local scour at piers has been reported as the most important factor in the destruction of the bridges . The use of submerged and non-submerged piles is one of the scour control methods . Submerged piles have been rarel...متن کامل
An attempt was made to develop a method for sizing stable riprap around bridge piers based on a huge amount of experimental data, which is available in the literature. All available experimental data for circular as well as round-nose-and-tail rectangular piers were collected. The data for rectangular piers, with different aspect ratios, aligned with the flow or skewed at different angles to th...متن کامل