scholarly journals Sediment load estimation in combined sewer systems located in semi-arid areas: a case study

2016 ◽  
Author(s):  
A. Trapote ◽  
R. Egea
Keyword(s):  
Sediment Load ◽  
Load Estimation ◽  
Arid Areas ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Semi Arid ◽  
Sediment Load Estimation

Sediment transport under dry weather conditions in a small sewer system

1998 ◽  
Vol 37 (1) ◽  
pp. 155-162
Author(s):  
Flemming Schlütter ◽  
Kjeld Schaarup-Jensen
Keyword(s):  
Sediment Transport ◽  
Field Data ◽  
Field Measurements ◽  
Weather Conditions ◽  
Sewer System ◽  
Transport Models ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Initial Results

Increased knowledge of the processes which govern the transport of solids in sewers is necessary in order to develop more reliable and applicable sediment transport models for sewer systems. Proper validation of these are essential. For that purpose thorough field measurements are imperative. This paper renders initial results obtained in an ongoing case study of a Danish combined sewer system in Frejlev, a small town southwest of Aalborg, Denmark. Field data are presented concerning estimation of the sediment transport during dry weather. Finally, considerations on how to approach numerical modelling is made based on numerical simulations using MOUSE TRAP (DHI 1993).

Developing nonlinear models for sediment load estimation in an irrigation canal

2018 ◽  
Vol 66 (6) ◽  
pp. 1485-1494 ◽  
Author(s):  
Fahad Ahmed ◽  
Muhammad Hassan ◽  
Hashim Nisar Hashmi
Keyword(s):  
Sediment Load ◽  
Nonlinear Models ◽  
Irrigation Canal ◽  
Load Estimation ◽  
Sediment Load Estimation

Development of sediment load estimation models by using artificial neural networking techniques

2015 ◽  
Vol 187 (11) ◽  
Author(s):  
Muhammad Hassan ◽  
M. Ali Shamim ◽  
Ali Sikandar ◽  
Imran Mehmood ◽  
Imtiaz Ahmed ◽  
...  
Keyword(s):  
Sediment Load ◽  
Load Estimation ◽  
Artificial Neural Networking ◽  
Artificial Neural ◽  
Sediment Load Estimation ◽  
Estimation Models

Influence of characteristics on combined sewer performance

2012 ◽  
Vol 66 (5) ◽  
pp. 1052-1060 ◽  
Author(s):  
M. Möderl ◽  
M. Kleidorfer ◽  
W. Rauch
Keyword(s):  
Automatic Generation ◽  
Negative Influence ◽  
Positive Influence ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Different Characteristics ◽  
Further Development ◽  
Storage Units ◽  
System Characteristics

Elements of combined sewer systems are among others sub-catchments, junctions, conduits and weirs with or without storage units. The spatial distribution and attributes of all these elements influence both system characteristics and sewer performance. Until today, little work has been done to analyse the influence of such characteristics in a case unspecific approach. In this study, 250 virtual combined sewer systems are analysed by defining groups of systems, which are representative for their different characteristics. The set was created with a further development of the case study generator (CSG), a tool for automatic generation of branched sewer systems. Combined sewer overflow and flooding is evaluated using performance indicators based on hydrodynamic simulations. The analysis of system characteristics, like those presented in this paper, helps researchers to understand coherences and aids practitioners in designing combined sewers. For instance, it was found that characteristics that have a positive influence on emission reduction frequently have a negative influence on flooding avoidance and vice versa.

scholarly journals Estimation of Suspended Sediment Concentrations with Adcp in Danube River

2013 ◽  
Vol 61 (3) ◽  
pp. 232-240 ◽  
Author(s):  
Sándor Baranya ◽  
János Józsa
Keyword(s):  
Measurement Uncertainty ◽  
Suspended Sediment ◽  
Sediment Load ◽  
Empirical Relationship ◽  
Danube River ◽  
Suspended Sediment Transport ◽  
Model Parameters ◽  
Load Estimation ◽  
Suspended Sediment Concentrations ◽  
Sediment Load Estimation

Abstract An estimation procedure for suspended sediment concentrations based on the intensity of backscattered sound of acoustic Doppler current profilers (ADCP) is introduced in this paper. Based on detailed moving and fixed boat ADCP measurements with concurrent sediment sampling, we have successfully calibrated the estimation method for a reach of River Danube in Hungary, characterized by significant suspended sediment transport. The effect of measurement uncertainty and various data filtering on sediment load determination is also analyzed and quantified. Some of the physical model parameters describing the propagation of sound in water are estimated based on known empirical formulas, while other parameters are derived from measured. Regression analysis is used to obtain a relationship between the intensity of backscattered sound and sediment concentrations. The empirical relationship has been then used to estimate the suspended sediment concentrations from the ADCP data collected in fixed and moving boat measurement operation mode, along verticals and path-lines, respectively. We show that while some measurement uncertainty is inherent to the acoustic Doppler principle, it is further enhanced by the complexity of the near-bottom sediment-laden flow. This uncertainty has then a significant effect on the local sediment load estimation. In turn, reasonable smoothing of raw velocity and backscatter intensity data shows insignificant impact on cross-sectional sediment load estimation.

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