The Presence of Jeringau (Acorus Calamus) as Flexible Vegetation Type in the Channel Against Flow Resistance

Rizalihadi, Maimun; Safiana, Dian

doi:10.1016/j.proeng.2015.11.036

Cited by 5 publications

(8 citation statements)

References 7 publications

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“…This research is a continuation of previous research as mentioned in [8], [9] and [10]. This study aims to see the effect of the ratio between the height of the rigid plant and water depth in open channel on Manning coefficient (n).…”

Section: Introductionmentioning

confidence: 78%

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The effect of ratio between rigid plant height and water depth on the manning’s coefficient in open channel

Rizalihadi

Ziana

Shaskia

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. One of the important factors in channel dimension is the Manning's coefficient (n).This coefficient is influenced not only by the channel roughness but also by the presence of plants in the channel. The aim of the study is to see the effect of the ratio between the height of the rigid plant and water depth on the Manning's coefficient (n) in open channel. The study was conducted in open channel with 15.5 m long, 0.5 m wide and 1.0 m high, in which at the center of the channel is planted with the rigid plants with a density of 42 plants/m 2 . The flow was run with a discharge of 0.013 m 3 /s at 6 ratios of H plants /H water , namely: 0; 0.2; 0.6; 0.8; 1,0 and 1,2, to obtain the velocity and water profiles. Then the value of n is analyzed using Manning's equation. The results showed that the mean velocity becomes decrease 17.81-34.01% as increase the ratio of H plants /H water . This results in increasing n value to become 1.22-1.52 times compared to the unplanted channel (n o =0.038). So, it can be concluded that the ratio between the rigid plant's height and water depth in the open channel can affect the value of Manning coefficient.

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Section: Introductionmentioning

confidence: 78%

“…These plants might be different characteristics of a different place. [9] has researched on a channel planted with jeringau (Acorus Calamus) which has flexible characteristics. Other research, [10] has also been done for elephant grass (Pennisetum Purpureum) which has rigid characteristics.…”

Section: Introductionmentioning

confidence: 99%

The effect of ratio between rigid plant height and water depth on the manning’s coefficient in open channel

Rizalihadi

Ziana

Shaskia

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The procedure of research method which is applied in this research is the same as and follows the previous research done by [6][7][8][9]. The difference is only on placing vegetation treatments and method of data analysis.…”

Section: Experimental Designs and Methodsmentioning

confidence: 99%

“…Because of its importance, so it is necessary to do further research by including for different treatments and type of vegetation growing in the channel to obtain the more reliable approach in general application of model. The objectives of this research is to study and to test statistically the effects of density and height of Sweet flag (Acorus Calamus) on Coefficient of Manning The study was laboratory experimental research by using Jeringau or Sweet flag (Acorus Calamus) planted in the channel, as prior research done by [7][8], but different treatment.…”

Section: Introductionmentioning

confidence: 99%

“…[7] studied the influence of height variation of vegetation on flow resistance, where the results showed that there was an increase in flow resistance in the channel which was indicated by an increase in the Manning coefficient (nv) ranging from 0.01-0.031 due to an increase in plant height. Meanwhile, [8] studied the influence of density variation of vegetation on flow resistance in the channel, and gave the results of an increase in the Manning coefficient (nv) as an increase in vegetation density between 0.013-0.031. This shows that both studies provide significant manning coefficient values due to the influence of vegetation height and density even in separate conditions Because of these effects, then the main object of this research is to describe the Coefficient of Manning by combining both effect of density and height of vegetation.…”

Section: Introductionmentioning

confidence: 99%

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The effect of density and height of vegetation in open channel on the Manning’s coefficient

Rizalihadi

2019

MATEC Web Conf.

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One of an important parameter to study water flow in channel is Manning’s coefficient (n). This coefficient is produced not only from material forming the channel, but also due to presence of vegetation in channel. The aim of research is to study the effect of vegetation density and height on Coefficient of Manning in open channel. The study was conducted in open channel with 15.5 m long, 0.5 m wide and 1.0 m high. At the center of 3 m long of channel is planted with Sweet flag (Acorus calamus). The impact of various densities and heights of sweet flag were examined using fixed discharge to measure velocity and slope energy. Coefficient of Manning was obtained using Manning’s equation. Statistical analysis of variance with significance level of 0.05 was adopted to evaluate the effect of variables. The result showed that increasing density and height of Sweet flag make decreasing velocity and increasing Coefficient of Manning to be 0,043-0,064, or 1.40-2.10 times compared to un-vegetated channel (no=0.031). Based on statistical analysis, it is found that Fcalc=15.646 and 16.928 for vegetation density and height respectively, which is larger than FStat=2,603. It can be concluded that density and height of vegetation significantly influence on Coefficient of Manning.

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Manning roughness coefficient in vegetated open channels

Elmoaty

El-Samman

2020

Water Science

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Manning equation is one of the most common equations used in estimating the mean velocity and discharge in open channels. The equation depends on some measured hydraulic parameters as water surface slope and hydraulic radius of open channel cross-section in addition to the Manning roughness coefficient. Estimating the value of Manning`s roughness coefficient is dependent on the nature of the channel, the number of obstacles that resist the channel flow and the field engineers experience. In vegetated channels, the percentage of infestation seems to be the most effective parameter on the roughness coefficient value. Through this study, based on laboratory investigation and physical model several trials were conducted to deduce an equation to predict the value of the Manning`s roughness coefficient in the vegetated channel based on measured parameters as weed infestation percentage, water surface slope. Two simple equations were deduced based on these parameters to practically estimate the value of the Manning roughness coefficient in vegetated open channels. The results of these equations were successfully verified using field measurements.

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The Presence of Jeringau (Acorus Calamus) as Flexible Vegetation Type in the Channel Against Flow Resistance

Cited by 5 publications

References 7 publications

The effect of ratio between rigid plant height and water depth on the manning’s coefficient in open channel

The effect of ratio between rigid plant height and water depth on the manning’s coefficient in open channel

The effect of density and height of vegetation in open channel on the Manning’s coefficient

Manning roughness coefficient in vegetated open channels

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