Relationships between the Zero-plane Displacement and the Roughness Length over Sorghum and Alfalfa Canopies.

Kimura, Reiji; Otsuki, Kyoichi; Kamichika, Makio

doi:10.2480/agrmet.55.15

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…Parameters of zero-plane displacement (d), roughness length (z0), and friction velocity (u*) were determined based on the logarithmic equation of wind profiles at various altitudes (Kimura et al, 1999;Yuhao et al, 2007). Zero-plane displacement (d) and roughness length (z0) were functions of surface roughness (June, 2022).…”

Section: Roughness Characteristicsmentioning

confidence: 99%

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Micrometeorological Method in Determining Plant Capacity to Absorb Pollutant: Oil Palm Case Study

Mu’allimah,

June,

Salmayenti

et al. 2023

Agromet

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The vegetation canopy's height and characteristics directly affect the turbulence that controls the exchange of mass and energy between the vegetation and the surrounding atmosphere. Turbulence also controls the momentum transfer towards the mass-carrying plant canopy and the accompanying atmospheric properties so that vegetation can contribute to pollutant deposition. This study aims to estimate the canopy capacity of oil palms to absorb pollutants based on their momentum transfer, the influence of atmospheric stability dynamics, and rainy and dry periods upon absorbed pollutants from PTPN VI in Jambi province for the period of January to December 2015 used micrometeorological observation data. The results showed that the dry deposition capacity value at the stable, neutral, and unstable atmospheric conditions were 2.06 x 10-3 kg/m2, 3.50 x 10-3 kg/m2, and 4.35 x 10-3 kg/m2, respectively. The stable or unstable conditions affected the momentum transfer through decreasing or increasing turbulence. In stable conditions, the cooling of the atmosphere impacts the turbulence to be restrained. The result also showed that the dry deposition capacity during the dry and rainy periods were 4.5 x 10-3 kg/m2 and 2.9 x 10-3 kg/m2, respectively. Further, atmospheric conditions tended to be unstable during the dry period, while the rainy period tended to be stable. This research showed that the momentum transfer method can estimate gas type pollutants by vegetation.

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Section: Roughness Characteristicsmentioning

confidence: 99%

“…Estimated of dry deposition capacity by oil palm crops at various plant heights were shown in Table 3. Zero-plane displacement (d) and roughness length (z0) can be estimated by taking into account the height of the plant canopy (h) (Kimura et al 1999). Zero-plane displacement (d) was 0.667 of the plant height (Oke, 1987).…”

Section: Dry Deposition Capacitymentioning

confidence: 99%

Micrometeorological Method in Determining Plant Capacity to Absorb Pollutant: Oil Palm Case Study

Mu’allimah,

June,

Salmayenti

et al. 2023

Agromet

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show abstract

“…The interaction of the crop with its surrounding air differs in monocropping and multiple cropping. The literature is available in case of sole crop [18][19][20]. The information on intercropping is scanty.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Wind Profile over Wheat and Mustard Canopies under Sole and Intercropped Conditions in Lower Gangetic Plain of Eastern India

Jena

Chakraborty

Bandyopadhyay

et al. 2020

CJAST

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Aim: Wind profile over a crop canopy affects several physiological processes. The nature of the wind profile above the crop canopy of a single crop has been reported in the literature. However, under intercropping system, the nature of wind profile isn’t well discussed. Methodology: With this background, a two-year experiment was conducted with five different crop combinations (T1- sole wheat, T2- sole mustard, T3- two wheat: six mustard, T4- four wheat: four mustard and T5- six wheat: two mustard) in Rndomized Block Design (RBD) of 54 m2 plot size. Wind speed was measured at 0.5, 1.0 and 1.5 m above the crop canopy from 9:30 to 13:30 hour at two-hour interval. The observations were taken from 30 to 80 days after emergence (DAE) at weekly interval. Results: Results showed that the wind speed gradually increased with the increment of height over the sole wheat. Wind speed sharply declined under intercropping over the wheat canopy. The percentage reduction in T3 was maximal on 58 DAE. The wind speed gradually increased with height for all observations in mustard irrespective of treatment combinations. However, under intercropping, wind speed reduced marginally at 0.5 m above mustard height compared to the sole mustard. Conclusion: Reduced wind speed over wheat canopy causes reduction of mass and momentum transfer thus reducing the carbon exchange rate which might be one of the reasons for lower biomass production in wheat-mustard intercrop in comparison to sole wheat crop.

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Estimation of evapotranspiration, transpiration ratio and water-use efficiency from a sparse canopy using a compartment model

Kato

Kimura

Kamichika

2004

Agricultural Water Management

116

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Relationships between the Zero-plane Displacement and the Roughness Length over Sorghum and Alfalfa Canopies.

Cited by 6 publications

References 29 publications

Micrometeorological Method in Determining Plant Capacity to Absorb Pollutant: Oil Palm Case Study

Micrometeorological Method in Determining Plant Capacity to Absorb Pollutant: Oil Palm Case Study

Characterization of Wind Profile over Wheat and Mustard Canopies under Sole and Intercropped Conditions in Lower Gangetic Plain of Eastern India

Estimation of evapotranspiration, transpiration ratio and water-use efficiency from a sparse canopy using a compartment model

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