Estimating sparse forest rainfall interception with an analytical model

Gash, J. H. C.; Lloyd, C.R.; Lachaud, Guy

doi:10.1016/0022-1694(95)02697-n

Cited by 449 publications

(480 citation statements)

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“…onde I = Perdas por interceptação; P = Precipitação acima do dossel; PI = Precipitação interna; PE = Precipitação efetiva; ESC = Escoamento pelo tronco (todos em mm) (Horton, 1919;Rutter et al, 1971, Gash, 1979Gash et al, 1995;Ubarana, 1994, 1996, Ferreira et al, 2005e Germer et al, 2006.…”

Section: Escoamento Pelos Troncosunclassified

Precipitação efetiva e interceptação em Caxiuanã, na Amazônia Oriental

et al. 2008

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RESUMOO presente trabalho foi realizado na Estação Cientifica Ferreira Penna, dentro da Floresta Nacional de Caxiuanã, Melgaço, Pará, Brasil (01º 42' 30"S; 51º 31' 45"W; 60 m altitude). A região é uma floresta de terra firme, com vegetação densa e dossel com altura média de 35 m e árvores emergentes acima de 50 m, densidade de 450 a 550 árvores por hectare. O objetivo foi o de quantificar a precipitação total incidente acima do dossel, precipitação efetiva e precipitação interna, o escoamento da água pelos troncos e interceptação da precipitação pela vegetação no período de março a dezembro de 2004, quando foram realizadas 40 coletas semanais. Na medida da precipitação interna foram utilizados 25 pluviômetros, distribuídos aleatoriamente em um hectare, subdividido em cem parcelas de 10 x 10 m, os escoamentos pelos troncos foram medidos em sete árvores com diâmetros à altura do peito (DAP) representativos para as árvores da área. O estudo revelou uma precipitação efetiva de 905,4 mm e precipitação interna de 885,4 mm, um escoamento pelos troncos de 20 mm e uma interceptação de 248 mm, correspondendo, a 78,5%, 76,8%, 1,7% e 21,5% da precipitação acima do dossel, que foi de 1.153,4 mm, no período de estudo, respectivamente.PalavRaS-chavE: Floresta tropical, interceptação, precipitação interna, escoamento pelo tronco. Net precipitation and interception in Caxiuanã, in the Eastern Amazonia aBSTRacTThe present work was carried out at the Ferreira Penna Scientific Station, in the Caxiuanã National Forest, Melgaço, Pará, Brazil (01º 42' 30"S; 51º 31' 45"W; 60 m a.s.l.). The studied region is an upland forest with closed vegetation and a mean canopy height of 35 m although some trees can be 50 m high. The species density is between 450 and 550 plants per hectare. The aim was to quantify the net precipitation, throughfall, stemflow and rain interception by vegetation, from March to December of 2004. For the throughfall measurements 25 rain gauges were randomly distributed in an one hectare area subdivided in one hundred parcels of 10 x 10 m, while the stemflow was measured on seven trees with a stem diameter at breast height representative of the area. The results showed values of net precipitation of 905.4 mm, throughfall of 885.4 mm, stemflow 20 mm and rain interception of 248 mm,corresponding respectively to 78.5%, 76.8%, 1.7% e 21.5% of the total precipitation above the canopy which was 1,153.4 mm for the study period.

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Section: Escoamento Pelos Troncosunclassified

Precipitação efetiva e interceptação em Caxiuanã, na Amazônia Oriental

et al. 2008

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“…When assessing the interception, it is necessary to consider the impact of factors related to both, misted surface (Tranqada & Erb 2014, Rosado & Holder 2013, Fernandez & Eicherd 2009 and the characteristics of the precipitation (Nanko et al 2006, Klamerus-Iwan 2014a. Gash et al (1995), Klaassen et al (1998), Liu (1997), Chang (2006) determined the retention possibility of crowns of deciduous and coniferous trees within 0.5-8.2 mm. In this context, it can be mentioned (Keim 2004) that the ability of crown to retain water can be treated as a constant value only for a single precipitation, subsequent precipitation can modulate this ability.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variability of interception and water wettability of common oak leaves

Klamerus‐Iwan

Błońska

2016

Ann. For. Res.

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A. Klamerus-Iwan, E. BłonskaKlamerus-Iwan A., Błonska E., 2017. Seasonal variability of interception and water wettability of common oak leaves. Ann. For. Res. 60(1): 63-73.Abstract. Wettability of leaves and the resulting amount of interception loss of tree crowns is an important component of the atmosphere-tree stand-soil system balance. In the study, we hypothesized that changes occurring in leaves during the vegetation period can significantly affect the amount of rainwater retained by plants and wettability of leaves which is expressed by the contact angle between drops and leaves. We evaluated the hypothesis based on measurement series, which combined direct spraying of leaves with water at different stages of development at a constant temperature with observations made with an electron scanner which was used to determine changes occurring within a leaf, while the photographic method was used to analyze the contact angle of drops. The study involved common oak (Quercus robur). Samples of twigs derived from this species were collected in the area of Przedbórz (Poland) forest district, in particular from the trees with well-developed crowns. Twigs were collected from 10 trees of similar age (35-40 years). The resulting database contained experimental data on changes of raindrop adhesion on oak leaves throughout the growing season. The internal contact angle of drops was within the range of 150° on the upper side of the leaf and 160° on the underside in May, up to 15° and 35° in November on the upper and underside of the leaves. Loss of interception was established at 6% at the beginning of the growing season up to 22% in autumn. It was concluded that the wettability and the level of interception increases in line with the age of a leaf.

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“…Evaporation from vegetation with partial canopy cover is assumed to be proportional to canopy cover (c) as proposed by Gash et al [1995]:…”

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Evaporation From rain‐wetted forest in relation to canopy wetness, canopy cover, and net radiation

Klaassen¹

2001

Water Resources Research

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Abstract. Evaporation from wet canopies is commonly calculated using E pM , the Penman-Monteith equation with zero surface resistance. However, several observations show a lower evaporation from rain-wetted forest. Possible causes for the difference between E pM and experiments are evaluated to provide rules for the simulation of rainfall interception by forest canopies. The evaluation is executed using a micrometeorological model with a detailed representation of the forest canopy. Simulated results are compared with experimental results. In spite of theoretical reservations the evaporation of completely wet forest appears to agree with EpM. Evaporation from wet forest appears mainly dependent on net radiation. Rainfall interception is related to evaporation from the canopy. Evaporation from the canopy appears proportional with the square root of canopy cover and sensitive to canopy wetness. An accurate estimate of canopy wetness is needed to use E pM for the calculation of evaporation from rain-wetted forest.

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Estimating sparse forest rainfall interception with an analytical model

Cited by 449 publications

References 14 publications

Precipitação efetiva e interceptação em Caxiuanã, na Amazônia Oriental

Precipitação efetiva e interceptação em Caxiuanã, na Amazônia Oriental

Seasonal variability of interception and water wettability of common oak leaves

Evaporation From rain‐wetted forest in relation to canopy wetness, canopy cover, and net radiation

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