Factors Affecting Generation of Hortonian Overland Flow in Forested Hillslopes: Analysis of Observation Results at Three Sites with Different Geology and Rainfall Characteristics.

Miyata, Sumiko; Onda, Yuichi; Gomi, Takashi; Mizugaki, Shigeru; Asai, Hiroaki; Hirano, Tomonori; Fukuyama, Takeshi; Kosugi, Ken’ichirou; Sidle, Roy C.; Terajima, Tomomi

doi:10.4005/jjfs.91.398

Cited by 14 publications

(15 citation statements)

References 28 publications

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“…Since the canopy interception loss ratio (= interception loss/ precipitation) in the bamboo forests has been reported as approximately 10% (Hattori and Abe, 1989;Wang and Liu, 1996;Lu et al, 2007;Onozawa et al, 2009), 60 to 70% of the total rainfall should infiltrate into the soil at our study site. Miyata et al (2009) showed that arithmetic means of f values ranged from 4 to 13% and surface runoff rarely occurred in similar size plots as our study (width 0.5 m, slope length 2 m) on the forested hillslopes of Japanese cedar (Cryptomeria japonica) plantations and broad-leaved forests. This indicates a predominance of infiltration of rainwater to the forest soils.…”

Section: Discussionsupporting

confidence: 70%

“…f > 100%) because rainwater accumulated as stemflow and intensively dripped from tree leaves and branches in the plantation during storm events. At our study site, the percentage of the total amount of surface runoff to the total rainfall was high compared with the other forested hillslopes described in Miyata et al (2009). On the other hand, the values of f did not exceed 100% (Table I) and were much lower than those observed in Miyata et al (2007).…”

Section: Discussioncontrasting

confidence: 49%

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A preliminary investigation of surface runoff and soil properties in a moso-bamboo (Phyllostachys pubescens) forest in western Japan

Ide

Shinohara

Higashi

et al. 2010

Hydrological Research Letters

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Abstract:To clarify plot-scale runoff characteristics in bamboo forests, soil properties and surface runoff were measured in a preliminary study of a forested hillslope of moso-bamboo (Phyllostachys pubescens). Infiltration capacities and saturated hydraulic conductivities at 10, 30 and 50 cm depths were similar to or greater in the moso-bamboo forest than in an adjacent broad-leaved forest. This suggests that surface runoff rarely occurs in the moso-bamboo forest. However, surface runoff was observed in seven of 14 storm events. The surface runoff responses to rainfalls were relatively rapid and the amount of surface runoff per storm event depended largely on rainfall. The proportion of the total amount of surface runoff to the total rainfall during the observation period ranged from 19 to 33%, depending on the observation system. This indicates that the greater portion of rainfall infiltrated into the soil. A high density of roots in the surface soil suggests that part of the rainfall was impeded and passed laterally through the surface soil as preferential flow around the root mats and/or the rhizomes, thereby contributing to surface runoff.

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Section: Discussionsupporting

confidence: 70%

Section: Discussioncontrasting

confidence: 49%

A preliminary investigation of surface runoff and soil properties in a moso-bamboo (Phyllostachys pubescens) forest in western Japan

Ide

Shinohara

Higashi

et al. 2010

Hydrological Research Letters

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“…A rainfall event was defined as precipitation with total rainfall > 5 mm and a rain-free period of no more than 10 h (Miyata et al, 2009). Information about each rainfall event, such as date, duration, total rainfall amount and maximum rainfall intensity, was recorded (see Tables S1 to S4).…”

Section: Rainfall Event and Runoff Amount Analysismentioning

confidence: 99%

Surface Runoff Generation and Soil Loss Under Different Soil and Rainfall Properties in The Uluguru Mountains, Tanzania

et al. 2016

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Water erosion is one of the main concerns driving land degradation in mountainous areas throughout the world, and its characteristics change widely with soil and climate conditions in different locations. To investigate the effects of soil and rainfall properties on surface runoff and soil loss, we installed runoff plots (width 0·8 m × slope length 2·4 m) enclosed by corrugated iron sheets, and evaluated water budgets for rainfall, surface runoff and soil moisture for every rainfall event over a rainy season at four sites (designated NY, TA, SO and MA) in the Uluguru Mountains of Tanzania. Two of the sites, NY and TA, were located in mountainous areas and had steep slopes and higher rainfall amounts, while the two foothill sites, SO and MA, were flatter and with coarser textures. Runoff amount was related to rainfall amount, but also to infiltration capacity. Runoff amounts in mountainous areas were higher than in foothill sites while runoff ratio was low at sites with high permeability in the surface layer, TA and MA. Sediment concentrations and soil loss were basically enhanced by high rainfall amount and intensity at mountainous sites. Soil texture also controlled the erodibility of soils; MA had twice the soil loss of SO owing to sandy soil despite similar rainfall amounts at MA and SO. Our results show that the high rainfall amounts in the mountainous areas and high susceptibility of sandy soils to erosion enhanced soil loss by water erosion in this study.

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“…TL basin topography, however, was steep and included well-developed channel networks and may have had a high capacity for rapid discharge of rainfall. Studies of slope gradient and saturated hydraulic conductivity, based on field observations (Miyata et al, 2009;Ribolzi et al, 2011;Fox and Bryan, 1999), Darcy's law, or numerical experiments using physical models have shown that surface flow depth is shallower when slope gradient is steeper (Wainwright and Parsons, 2002). Because CL includes a gentle ridge with a deep soil layer near the centre of the basin, it can be considered that CL exhibits high potential for pooling rainwater in the surface soil over time.…”

Section: Effects Of Topography On Stream Runoffmentioning

confidence: 99%

Comparison of runoff characteristics of two adjacent basins in a tropical rainforest using a modified hydrologic cycle model with outflow

2012

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Abstract:We propose a new runoff model including an outflow process that was applied to two adjacent basins (CL, TL) located in Lambir Hills National Park in north-central Sarawak, Malaysia. Rainfall, runoff, topography, and soil layer thickness were observed. About 19% of annual runoff was observed in the CL basin (21.97 ha), whereas about 46% was observed in the TL basin (23.25 ha). It was inferred that the CL basin has an outflow because of low base flow, small runoff peak, and excessive water loss. By incorporating the outflow process into the HYdrological CYcle MODEL, good agreement between the data generated by the model and that observed was shown, with the exception of the data from the rainless period. Then, the fitting parameters for each basin were exchanged, except for the outflow parameter, and the characteristics of each basin were compared by calculating virtual runoff. As a result, the low base flow of the CL basin was estimated by the movement of the rainwater that escaped from the basin as deep percolation or lateral flow (11% of rainfall). The potential of the CL basin for mitigating flood and drought appeared to be higher than that of the TL basin. This is consistent with the topographic characteristics of the CL basin, which has a gentler slope than the TL basin.

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Factors Affecting Generation of Hortonian Overland Flow in Forested Hillslopes: Analysis of Observation Results at Three Sites with Different Geology and Rainfall Characteristics.

Cited by 14 publications

References 28 publications

A preliminary investigation of surface runoff and soil properties in a moso-bamboo (Phyllostachys pubescens) forest in western Japan

A preliminary investigation of surface runoff and soil properties in a moso-bamboo (Phyllostachys pubescens) forest in western Japan

Surface Runoff Generation and Soil Loss Under Different Soil and Rainfall Properties in The Uluguru Mountains, Tanzania

Comparison of runoff characteristics of two adjacent basins in a tropical rainforest using a modified hydrologic cycle model with outflow

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