Hydrological changes and its impact on water resources of Bagmati watershed, Nepal

Sharma, Raj Hari; Shakya, Narendra Man

doi:10.1016/j.jhydrol.2005.11.051

Cited by 92 publications

(62 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A metodologia empregada na análise da tendência das variáveis hidrológicas precipitação e vazão foi a descrita por Pruski et al (2005), Pereira et al (2005), Sharma & Shakya (2006) e Latuf (2007. O método consiste em estimar equações de regressão linear simples entre a variável hidrológica (considerada variável dependente) e o tempo (variável independente), o que permite a identificação da propensão de mudanças das variáveis estudadas ao longo do período analisado .…”

Section: Análise Da Tendência Do Comportamento Hidrológicounclassified

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

Santos¹,

Griebeler

Oliveira

2010

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

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.

show abstract

Section: Análise Da Tendência Do Comportamento Hidrológicounclassified

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

Santos¹,

Griebeler

Oliveira

2010

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

show abstract

“…Declining of groundwater table may entail adverse impacts such as land subsidence and sea (salt) water intrusion in the coastal area (Sharma et al, 2006). Jakarta and Bandung, large cities of Indonesia, have suffered from the land subsidence due to excessive extraction of groundwater (Taufiq et al, 2014).…”

Section: Previous Studiesmentioning

confidence: 99%

Spatial Model for Ground Water Conservation Based on Landform Approach in the Southern Flank of Merapi Vulcano

Hargono¹,

Sartohadi²,

Pramonohadi³

et al. 2014

JGES

View full text Add to dashboard Cite

The research is focused on the urban City of Yogyakarta. This location is the most densely populated with the highest number of population in the southern flank of Merapi Volcano, with the consequence of the highest water requirement. The southern flank of Merapi Volcano is an area with very high intensity of precipitation, however declining of groundwater table has occurred for quite of years with an intensive rate. It is therefore, groundwater conservation effort is required in the urban city of Yogyakarta. This research is aimed at; 1) making a hydrology spatial model to understand the water balance based on landform approach on the research area; 2) to find the area suffering from water scarcity and when the scarcity occurs; and 3) recommendation on groundwater conservation effort to overcome the water scarcity. The methods applied are to make a spatial model of the research area based on landforms, river interfluves, water availabilty analysis, water balance analysis to find where and when the scarcity occurs, and the analysis for water conservation. The research area is naturally divided into 12 unit areas based on landforms and interfluves. The analysis has shown the unit areas when and where the water scarcity occur using water requirements of 120 liter/capita/day and 50 liter/capita/day. The proposed conservation effort is applying rainstorm management that rain water shall be considered as water resources not flood or standing water to be drained away, and keep the hydrologic function of the area remains unchanged after a development. A spatial model is constructed on the most seriously suffered unit area which is divided into microcatchments. A microcatchment is a single hydrology unit having independent drainage system, where efforts on the unchanged hydrology functions are implemented and analyzed..

show abstract

“…The changing hydrologic regimes induced by climate change and resulting in variations in available water resources will strongly influence not only the eco-environment and socio-economic development of the local region, but also the downstream areas [5][6][7][8]. Thus, understanding the spatiotemporal responses of water resources to the changing climate is crucial to identifying future water availability and developing sustainable management plans [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Assessing Climate Change Impacts on Water Resources in the Songhua River Basin

Zhang

2016

Water

View full text Add to dashboard Cite

Abstract:The Songhua River Basin (SRB) in Northeast China is one of the areas most sensitive to global climate change because of its high-latitude location. In this study, we conducted a modeling assessment on the potential change of water resources in this region for the coming three decades using the Soil and Water Assessment Tool (SWAT). First, we calibrated and validated the model with historical streamflow records in this basin. Then, we applied the calibrated model for the period from 2020 to 2049 with the projected and downscaled climatic data under two emission scenarios (RCP 4.5 and RCP 8.5). The study results show: (1) The SWAT model performed very well for both the calibration and validation periods in the SRB; (2) The projected temperatures showed a steady, significant increase across the SRB under both scenarios, especially in two sub-basins, the Nenjiang River Basin (NRB) and the Lower SRB (LSRB). With regard to precipitation, both scenarios showed a decreasing trend in the NRB and LSRB but an increasing trend in the Upper Songhua River Basin (USRB); and (3), generally, the hydrologic modeling suggested a decreasing trend of streamflow for 2020-2049. Compared to baseline conditions , the streamflow in the NRB and LSRB would decrease by 20.3%-37.8%, while streamflow in the USRB would experience an increase of 9.68%-17.7%. These findings provide relevant insights into future surface water resources, and such information can be helpful for resource managers and policymakers to develop effective eco-environment management plans and strategies in the face of climate change.

show abstract

Hydrological changes and its impact on water resources of Bagmati watershed, Nepal

Cited by 92 publications

References 7 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

Spatial Model for Ground Water Conservation Based on Landform Approach in the Southern Flank of Merapi Vulcano

Assessing Climate Change Impacts on Water Resources in the Songhua River Basin

Contact Info

Product

Resources

About