Effects of self-regulation mechanisms in vegetated channels on hydraulic resistance
View/Open
Report (1,209Mb) (Restricted access)
Cita com:
hdl:2099.1/11223
Tutor / directorNikora, Nina
Document typeMaster thesis (pre-Bologna period)
Date2009
Rights accessRestricted access - author's decision
All rights reserved. This work is protected by the corresponding intellectual and industrial
property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public
communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
The aim of this thesis is to analyse the effects of self-regulation mechanisms in open
channels with vegetated bed on hydraulic resistance, particularly bed slope effects. In
order to examine them, laboratory experiments are carried out with artificial roughness.
The self-regulation mechanisms investigated are: mean water depth, flow penetration
depth and canopy height, as well as the applicability of Grishanin’s equation to open
channels with vegetated bed.
The first step is to perform this investigation is a preliminary analysis of the flume and
its working conditions. Specific trials such as calibration of the flume with and without
roughness elements and acoustic velocity measurements are performed.
The results obtained are based on data collected from two types of experiments:
hydraulic resistance and flow penetration. The experiments are performed using one
type of roughness and density. This is tested for five different slopes 1in: 333, 500, 750,
1000, 2000 and six different flow rates: 10, 15, 20, 25, 30, 35 l/s, which is a total of
thirty flow conditions. The laboratory experiments are performed in a 12.5m tilting
flume with all the bed covered with roughness.
The consistence of Grishanin’s equation fails for this setup, not being applicable.
Therefore more research with a wider range of conditions might be performed.
Moreover, it is found that might be different calibration line for low and high flow rates.
There is also a different trend of the parameters analysed for steep slopes such as 1 in:
333, 500 and flatter slopes such as 1 in: 750, 1000, 2000.
This thesis enables to know some of the effects of submerged vegetation in rivers and
also how to relate them with its ecosystem in order to be able to model and predict
water quality improvements.
SubjectsMeasurement, Calibration, Hydraulic engineering, Mesurament, Calibratge, Enginyeria hidràulica
ProvenanceAquest document conté originàriament altre material i/o programari no inclòs en aquest lloc web
DegreeENGINYERIA INDUSTRIAL (Pla 1994)
Files | Description | Size | Format | View |
---|---|---|---|---|
Effects of self-regulation mechanisms.pdf![]() | Report | 1,209Mb | Restricted access |