Effectiveness of Vegetative Filter Strips for Sediment Removal under Field Conditions

Shiono, Takeshi; Nakamura, Hajime; Haraguchi, Naotsugu; Taruya, Hiroyuki; Miyamoto, Teruhito

doi:10.2480/agrmet.1021

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Field studies on agricultural plots in Okinawa have demonstrated the effectiveness of grass strips in reducing the eroded sediment runoff from upland fields in several specific cases 12,14,16 . However, these studies did not report in detail on the effectiveness of grass strips for controlling the fine sediment which pollutes the coastal area.…”

Section: Introductionmentioning

confidence: 99%

Performance of Grass Strips for Sediment Control in Okinawa

Shiono¹,

Yamamoto²,

Haraguchi³

et al. 2007

JARQ

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Reddish fine sediment runoff from upland fields has been one of the causes of coastal environmental pollution in Okinawa, Japan. Planting grass strips is a well-known measure to reduce runoff of nonpoint-source pollutants from agricultural fields. In this study, we investigated the performance of a centipede grass (Eremochloa ophiuroides (Munro) Hack.) strip for reducing sediment runoff from an upland field in Okinawa, focusing on strip length and sediment aggregate size as factors affecting performance. Field experiments were conducted in field plots with a 4.0-m by 31.5-m bare source area on a Kunigami-Maji soil using three strip lengths (0.5, 1.5 and 3.0 m) under natural conditions. The sediment removal efficiencies were 24% for the 0.5-m strip, 36 to 54% for the 1.5-m strip and 73% for the 3.0-m strip. The strips trapped well the sediment aggregates larger than 0.02 mm in diameter, regardless of strip length. The longer strip trapped more aggregates of the 0.002-0.02-mm size class, which were dominant in the eroded sediment runoff from the plots. The strips poorly trapped aggregates smaller than 0.002 mm. The sediment trapping resulted primarily from deposition of sediment due to slowdown of surface flow.

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Section: Introductionmentioning

confidence: 99%

Performance of Grass Strips for Sediment Control in Okinawa

Shiono¹,

Yamamoto²,

Haraguchi³

et al. 2007

JARQ

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“…The model was verified by data obtained from centipede grass strip experiments (Shiono et al 2005(Shiono et al , 2007a. …”

Section: Model Verificationmentioning

confidence: 99%

“…We compared model output for 1) time series behavior of sediment runoff and 2) sediment yield. The time-series data was obtained from the experiment with 1.5 and 3.0 m long strip plots in a rainstorm event due to Typhoon Etau on 7 August 2003(Shiono et al 2005). The sediment yield data was obtained twice a month from the experiment with 0.5 and 1.5 m long strip plots from 12 April to 1 December 2004(Shiono et al 2007a).…”

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confidence: 99%

Evaluation of strips of centipede grass for sediment load reduction

Shiono

Haraguchi

Miyamoto

et al. 2008

Water Science and Technology

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Reddish sediment runoff from agricultural fields results in coastal environmental problems in Okinawa, Japan. Recent studies have demonstrated the effectiveness of strips of centipede grass (Eremochloa ophiuroides (Munro) Hack.), a perennial turf grass, in reducing the sediment loads from farmlands. However, sufficient information has not been provided to determine the appropriate strip specifications in the grass strip design. This study evaluated centipede grass strips for reduction of reddish sediment runoff from farmlands in Okinawa, Japan. A numerical model simulating the reddish sediment transport in the grass strip was constructed to determine the sediment removal efficiency of the strip. The model was verified using data obtained from field plot experiments with the grass strips under natural conditions. The sensitivity analysis of the model showed that the length of the grass strip (i.e. the dimension of the strip in the direction of flow) and unit inflow discharge have a great effect on sediment removal efficiency. The sediment removal efficiency obtained from the model simulation increased with the length of the strip and the increment of the efficiency decreased with the length of the strip. Therefore, these results indicate that the effective and efficient length of a centipede grass strip is 3 m for the reduction of reddish sediment loads under typical farmland conditions in Okinawa.

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