Influences of forests on water flows from headwater watersheds in Taiwan

Cheng, Jiangfeng; Lin, Laurence; Lu, Houquan

doi:10.1016/s0378-1127(01)00626-0

Cited by 65 publications

(61 citation statements)

References 19 publications

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“…Neste sentido, estudos sobre a hidrologia de bacias hidrográficas e sua associação com a variabilidade climática e o uso do solo, consistem em uma demanda atual e de expressiva importância para o estabelecimento de medidas visando ao desenvolvimento sustentável, subsidiando as ações dos órgãos responsáveis pela gestão de recursos hídricos (Bosh & Hewlet, 1982;Calder, 1993;Cheng et al, 2002;Engel et al, 2005;Farley et al, 2005).…”

Section: Introductionunclassified

Relação entre uso do solo e comportamento hidrológico na Bacia Hidrográfica do Ribeirão João Leite

Santos¹,

Griebeler

Oliveira

2010

Rev. bras. eng. agríc. ambient.

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RESUMOO comportamento hidrológico de bacias hidrográficas decorre principalmente da variabilidade dos processos climáticos e do uso do solo. A Bacia do Ribeirão João Leite constitui-se no principal manancial de abastecimento de Goiânia e, recentemente, foram verificadas intensas modificações no uso do solo e disponibilidade de água. Neste contexto, tevese como objetivo classificar o uso do solo entre 1979 e 2005 e realizar a associação do escoamento com o uso do solo e a variabilidade pluviométrica. Para isto, se utilizaram imagens Landsat dos anos de 1979, 1989, 1997 e 2005, além de dados fluviométricos e pluviométricos disponibilizados pela Agência Nacional de Águas (ANA). O uso do solo foi marcado pelo desmatamento de 17,8% da vegetação nativa, expansão das áreas de urbanização e agricultura em 6,6 e 15,2%, respectivamente, e pela expressiva área de pastagens. Constatou-se tendência de redução no escoamento explicada, em parte, pela redução do regime de chuvas; contudo, devido ao expressivo aumento da água captada e à ausência de registros históricos, houve dificuldade na associação qualitativa entre o escoamento e o uso do solo, apesar de serem gerados modelos por regressão linear com coeficientes de determinação (R²) acima de 0,75. Palavras-chave: recursos hídricos, vazão, GoiâniaRelationship between land use and hydrological behavior in the 'Ribeirão João Leite' watershed ABSTRACTThe hydrological behavior of watersheds derives mainly from climate variability and land use. The 'Ribeirão João Leite' watershed is the main sourse of water supply in Goiânia city, and recently intense modifications were observed in the land use and availability of water. In this context, this work proposes to classify the land use between 1979 and 2005 and establish the association of the runoff with the land use and climate variability. For this, Landsat images from the years 1979, 1989, 1997 and 2005 were used as well as flow and rainfall data provided by the Agência Nacional de Água (ANA). The land use was marked by 17.8% of deforestation, expansion of the urbanization and agriculture corresponded to 6.6 and 15.2%, respectively, and by significant areas of pasture. A trend of reduction in flow was observed that could be explained, in part, by a reduction in the rainfall regime. However, due to the significant increase of water withdrawal and the lack of historical records, there was difficulty in qualitative association between the runoff and the land use in spite of generating linear regression models with coefficients of determination (R²) above 0.75.

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Section: Introductionunclassified

Relação entre uso do solo e comportamento hidrológico na Bacia Hidrográfica do Ribeirão João Leite

Santos¹,

Griebeler

Oliveira

2010

Rev. bras. eng. agríc. ambient.

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“…It has been addressed on various spatial scales, especially with regard to the effect of clear cutting on peak flow (e.g. Beschta et al, 2000;Cheng et al, 2002;Tremblay et al, 2008). For example, Cognard-Plancq et al (2001) claimed that forest-covered soils can store more water than soils without trees.…”

Section: Introductionmentioning

confidence: 99%

Significance of tree roots for preferential infiltration in stagnic soils

Lange

Luescher

Germann

2009

Hydrol. Earth Syst. Sci.

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Abstract. It is generally recognized that roots have an effect on infiltration. In this study we analysed the relation between root length distributions from Norway spruce (Picea abies (L.) Karst), silver fir (Abies alba Miller), European beech (Fagus sylvatica L.) and preferential infiltration in stagnic soils in the northern Pre-Alps in Switzerland. We conducted irrigation experiments (1 m 2 ) and recorded water content variations with time domain reflectometry (TDR). A rivulet approach was applied to characterise preferential infiltration. Roots were sampled down to a depth of 0.5 to 1 m at the same position where the TDR-probes had been inserted and digitally measured. The basic properties of preferential infiltration, film thickness of mobile water and the contact length between soil and mobile water in the horizontal plane are closely related to root densities. An increase in root density resulted in an increase in contact length, but a decrease in film thickness. We modelled water content waves based on root densities and identified a range of root densities that lead to a maximum volume flux density and infiltration capacity. These findings provide convincing evidence that tree roots in stagnic soils represent the pore system that carries preferential infiltration. Thus, the presence of roots should improve infiltration.

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“…That is, about three to four typhoons make landfall in Taiwan in one year (mostly during June to October). During typhoons, heavy rainfall often causes various types of damages, such as floods, inundation, and landslides, and result in loss of life and property damage [1]. However, typhoon rainfall is also one of the most important water resources in Taiwan.…”

Section: Introductionmentioning

confidence: 99%

Effective Use of Ensemble Numerical Weather Predictions in Taiwan by Means of a SOM-Based Cluster Analysis Technique

Hong²,

Hsiao

et al. 2017

Water

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Abstract:Typhoon rainfall is one of the most important water resources in Taiwan. However, heavy rainfall during typhoons often leads to serious disasters. Therefore, accurate typhoon rainfall forecasts are always desired for water resources managers and disaster warning systems. In this study, the quantitative rainfall forecasts from an ensemble numerical weather prediction system in Taiwan are used. Furthermore, a novel strategy, which is based on the use of a self-organizing map (SOM) based cluster analysis technique, is proposed to integrate these ensemble forecasts. By means of the SOM-based cluster analysis technique, ensemble forecasts that have similar features are clustered. That is helpful for users to effectively combine these ensemble forecasts for providing better typhoon rainfall forecasts. To clearly demonstrate the advantage of the proposed strategy, actual application is conducted during five typhoon events. The results indicate that the ensemble rainfall forecasts from numerical weather prediction models are well categorized by the SOM-based cluster analysis technique. Moreover, the integrated typhoon rainfall forecasts resulting from the proposed strategy are more accurate when compared to those from the conventional method (i.e., the ensemble mean of all forecasts). In conclusion, the proposed strategy provides improved forecasts of typhoon rainfall. The improved quantitative rainfall forecasts are expected to be useful to support disaster warning systems as well as water resources management systems during typhoons.

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Influences of forests on water flows from headwater watersheds in Taiwan

Cited by 65 publications

References 19 publications

Relação entre uso do solo e comportamento hidrológico na Bacia Hidrográfica do Ribeirão João Leite

Relação entre uso do solo e comportamento hidrológico na Bacia Hidrográfica do Ribeirão João Leite

Significance of tree roots for preferential infiltration in stagnic soils

Effective Use of Ensemble Numerical Weather Predictions in Taiwan by Means of a SOM-Based Cluster Analysis Technique

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