scholarly journals Land use and water quality in watersheds in the State of São Paulo, based on GIS and SWAT data

2019 ◽  
Vol 14 (5) ◽  
pp. 1
Author(s):  
Denise Piccirillo Barbosa da Veiga ◽  
Manuel Enrique Gamero Guandique ◽  
Adelaide Cassia Nardocci
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Surface Runoff ◽  
Integrated Management ◽  
Swat Model ◽  
Land Use Classification ◽  
Hydrological Simulation ◽  
Hydrological Balance ◽  
Gis Tools ◽  
The Impact

Land use influences the quality and availability of water resources, but Brazil has made little progress in integrated watershed management. This study therefore applied geoprocessing for land-use classification and evaluated the impact on the hydrological balance in order to contribute to the integrated management of water resources. Using GIS tools, two drainage areas from the water catchment points of two municipalities, Santa Cruz das Palmeiras and Piedade, were delimited; land-use mapping was carried out using the supervised classification method of satellite images, and the SWAT model was applied for hydrological simulation. The methods used were appropriate. The surface runoff was related to the absence of vegetation and the predominance of exposed soil. The relationship between land use/land cover and the hydrological balance was evidenced, especially the impact of agricultural activities and the lack of natural vegetation in the surface runoff.

scholarly journals Evaluating and Predicting the Effects of Land Use Changes on Hydrology in Wami River Basin, Tanzania

Hydrology ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 17 ◽  
Author(s):  
Sekela Twisa ◽  
Shija Kazumba ◽  
Mathew Kurian ◽  
Manfred F. Buchroithner
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Assessment Tool ◽  
Swat Model ◽  
Land Use Changes ◽  
Management Strategies ◽  
River System ◽  
Least Squares Regression ◽  
Natural Forests ◽  
The Impact

Understanding the variation in the hydrological response of a basin associated with land use changes is essential for developing management strategies for water resources. The impact of hydrological changes caused by expected land use changes may be severe for the Wami river system, given its role as a crucial area for water, providing food and livelihoods. The objective of this study is to examine the influence of land use changes on various elements of the hydrological processes of the basin. Hybrid classification, which includes unsupervised and supervised classification techniques, is used to process the images (2000 and 2016), while CA–Markov chain analysis is used to forecast and simulate the 2032 land use state. In the current study, a combined approach—including a Soil and Water Assessment Tool (SWAT) model and Partial Least Squares Regression (PLSR)—is used to explore the influences of individual land use classes on fluctuations in the hydrological components. From the study, it is evident that land use has changed across the basin since 2000 (which is expected to continue in 2032), as well as that the hydrological effects caused by land use changes were observed. It has been found that the major land use changes that affected hydrology components in the basin were expansion of cultivation land, built-up area and grassland, and decline in natural forests and woodland during the study period. These findings provide baseline information for decision-makers and stakeholders concerning land and water resources for better planning and management decisions in the basin resources’ use.

scholarly journals Future Climate Change Impact on the Nyabugogo Catchment Water Balance in Rwanda

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3636
Author(s):  
Adeline Umugwaneza ◽  
Xi Chen ◽  
Tie Liu ◽  
Zhengyang Li ◽  
Solange Uwamahoro ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Water Balance ◽  
Surface Runoff ◽  
Hydrological Cycle ◽  
Swat Model ◽  
Global Climate Models ◽  
Future Climate Change ◽  
Baseline Scenario ◽  
The Impact

Droughts and floods are common in tropical regions, including Rwanda, and are likely to be aggravated by climate change. Consequently, assessing the effects of climate change on hydrological systems has become critical. The goal of this study is to analyze the impact of climate change on the water balance in the Nyabugogo catchment by downscaling 10 global climate models (GCMs) from CMIP6 using the inverse distance weighting (IDW) method. To apply climate change signals under the Shared Socioeconomic Pathways (SSPs) (low and high emission) scenarios, the Soil and Water Assessment Tool (SWAT) model was used. For the baseline scenario, the period 1950–2014 was employed, whereas the periods 2020–2050 and 2050–2100 were used for future scenario analysis. The streamflow was projected to decrease by 7.2 and 3.49% under SSP126 in the 2020–2050 and 2050–2100 periods, respectively; under SSP585, it showed a 3.26% increase in 2020–2050 and a 4.53% decrease in 2050–2100. The average annual surface runoff was projected to decrease by 11.66 (4.40)% under SSP126 in the 2020–2050 (2050–2100) period, while an increase of 3.25% in 2020–2050 and a decline of 5.42% in 2050–2100 were expected under SSP585. Climate change is expected to have an impact on the components of the hydrological cycle (such as streamflow and surface runoff). This situation may, therefore, lead to an increase in water stress, calling for the integrated management of available water resources in order to match the increasing water demand in the study area. This study’s findings could be useful for the establishment of adaptation plans to climate change, managing water resources, and water engineering.

scholarly journals Analyzing the impacts of climate and land use changes on the water quality in the 3S river basin

2019 ◽  
Vol 2 (2) ◽  
pp. 125-131
Author(s):  
Loi Thi Pham ◽  
Khoi Nguyen Dao
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Land Use ◽  
Water Resources ◽  
Land Use Change ◽  
River Basin ◽  
Water Resource Management ◽  
Hydrological Modeling ◽  
Swat Model ◽  
The Impact

Assessing water resources under the influence of environmental change have gained attentions of scientists. The objective of this study was to analyze the impacts of land use change and climate change on water resources in terms quantity and quality in the 3S basin in the period 1981–2008 by using hydrological modeling (SWAT model). The results showed that streamflow and water quality (TSS, T-N, and T-P) tend to increase under individual and combined effects of climate change and land use change. In addition, the impact of land use change on the flow was smaller than the climate change impact. However, water balance components and water quality were equally affected by two factors of climate change and land use change. In general, the results of this study could serve as a reference for water resource management and planning in the river basin.

scholarly journals Impact of Change in Land Use Land Cover on Water Resources in Gundlakamma Sub Basin

2020 ◽  
pp. 33-46
Author(s):  
N. Hari ◽  
A. Mani ◽  
H. V. Hema Kumar ◽  
V. Srinivasa Rao ◽  
L. Edukondalu
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Field Survey ◽  
Assessment Tool ◽  
Swat Model ◽  
Secondary Data ◽  
Land Use Land Cover ◽  
The Impact ◽  
Water Assessment ◽  
Good Agreement

The present study was conducted to investigate the impact of land use cover change on water resources availability in Gundlakamma Subbasin. The Gundlakamma subbasin is predominantly agricultural based and Gundlakamma is a seasonal river. Hence, a study has been conducted to simulate the availability of water resources in the subbasin using SWAT (Soil and Water Assessment Tool) model. The database was generated like DEM, soil map and land use/cover using the secondary data and field survey. The SWAT model was calibrated three years (2010-2012) and validated with four years (2013-2016) with the observed discharges from reservoir outflow. The values of NSE and R2 was found as 0.79 and 0.87 during calibration, 0.65 and 0.72, respectively during validation. The modelled values showed reasonably good agreement with the observed values of reservoir outflow, both during calibration and validation periods. The reservoir outflow in the subbasin was quantified under the change land use conditions.

scholarly journals Impacts of land use changes and climate variability on transboundary Hirmand River using SWAT

2019 ◽  
Vol 11 (4) ◽  
pp. 1695-1711 ◽  
Author(s):  
Mohammadreza Hajihosseini ◽  
Hamidreza Hajihosseini ◽  
Saeed Morid ◽  
Majid Delavar ◽  
Martijn J. Booij
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Land Use Change ◽  
Environmental Changes ◽  
Swat Model ◽  
Land Use Changes ◽  
River Basins ◽  
Irrigated Area ◽  
The Impact ◽  
Annual Discharge

Abstract Many river basins are facing a reduction of flows which might be attributed to changes in climate and human activities. This issue is very important in transboundary river basins, where already existing conflicts about shared water resources between riparian countries can easily escalate. The decrease of streamflow in the transboundary Hirmand (Helmand) River is one of the main challenges for water resources management in Iran and Afghanistan. This research aims to quantify the causes of this problem which has a direct impact on the dryness of the Hamoun wetlands being an international Ramsar site. To achieve this, the land use changes in the Middle Helmand Basin (MHB) in Afghanistan were evaluated for three time periods between 1990 and 2011 using remote sensing data and the Soil and Water Assessment Tool (SWAT) Model for understanding watershed response to environmental changes. It was concluded that the total irrigated area in the region has increased from 103,000 ha in 1990 to 122,000 ha in 2001 and 167,000 ha in 2011 (62% increase). According to the results, the average annual discharge when adapting the land use during the simulations was 4,787 million cubic meters (MCM)/year and while employing the land use of 1990 from the beginning of the simulations, the average annual discharge was 5,133 MCM/year. Therefore, the agricultural developments in the Helmand basin decreased the discharge with about 346 MCM/year accompanying an increase of 64,000 ha in an irrigated area in MHB after 1990. Notably, the impact of land use change increases significantly for more recent periods and causes a reduction of 810 MCM in annual streamflow for the MHB. The amount of water depletion (i.e. actual evapotranspiration) per hectare has increased from 5,690 in 1985 to 7,320 m3 in 2012. The applied methodology of this study is useful to cope with such a data scarcity region. It can help quantify the impact of land use change on the region and formulates strategies that can improve the situation between Iran and Afghanistan.

scholarly journals Hydrological Responses of Watershed to Historical and Future Land Use Land Cover Change Dynamics of Nashe Watershed, Ethiopia

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2372
Author(s):  
Megersa Kebede Leta ◽  
Tamene Adugna Demissie ◽  
Jens Tränckner
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Land Cover ◽  
Surface Runoff ◽  
Environmental Changes ◽  
Swat Model ◽  
Land Resource ◽  
Land Use Land Cover ◽  
Lulc Change ◽  
Hydrological Parameters

Land use land cover (LULC) change is the crucial driving force that affects the hydrological processes of a watershed. The changes of LULC have an important influence and are the main factor for monitoring the water balances. The assessment of LULC change is indispensable for sustainable development of land and water resources. Understanding the watershed responses to environmental changes and impacts of LULC classes on hydrological components is vigorous for planning water resources, land resource utilization, and hydrological balance sustaining. In this study, LULC effects on hydrological parameters of the Nashe watershed, Blue Nile River Basin are investigated. For this, historical and future LULC change scenarios in the Nashe watershed are implemented into a calibrated Soil and Water Assessment Tool (SWAT) model. Five LULC scenarios have been developed that represent baseline, current, and future periods corresponding to the map of 1990, 2005, 2019, 2035, and 2050. The predicted increase of agricultural and urban land by decreasing mainly forest land will lead till 2035 to an increase of 2.33% in surface runoff and a decline in ground water flow, lateral flow, and evapotranspiration. Between 2035 and 2050, a gradual increase of grass land and range land could mitigate the undesired tendency. The applied combination of LULC prognosis with process-based hydrologic modeling provide valuable data about the current and future understanding of variation in hydrological parameters and assist concerned bodies to improve land and water management in formulating approaches to minimize the conceivable increment of surface runoff.

scholarly journals The assessment of the impact of short-term land use/cover changes on water resources in the Yanghe reservoir basin, China

2021 ◽  
Author(s):  
Daming Li ◽  
Shilong Bu ◽  
Shuo Chen ◽  
Qicheng Li ◽  
Yanqing Li
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Land Use Planning ◽  
Assessment Tool ◽  
Swat Model ◽  
Green Water ◽  
Hydrological Process ◽  
Unused Land ◽  
Reservoir Basin ◽  
The Impact

Abstract Land Use/Land Cover (LULC) is the main factor that affects the hydrological process of catchment. A better understanding of its influence is of great significance to future land use planning and water resources management. Since 2011, the local government has implemented the land remediation plan, and the LULC has undergone major changes in the Yanghe Reservoir Basin. This paper used The Soil and Water Assessment Tool (SWAT) model to study the Blue Water (BW) and Green Water (GW) resources in three typical years (wet year, dry year, and normal year) under the two LULC scenarios in 2010 and 2017 of the basin. The results showed that from 2010 to 2017, the area of cultivated land and residential construction land increased by 227.28% and 269.23%, respectively; the area of unused land, woodland, and grassland decreased by 98.84%, 35.90% and 39.52%, respectively. Compared with the results of the 2010 LULC scenario, the average BW of the three typical years under the 2017 LULC scenario decreased by 11.66%, 52.32%, and 21.95%, respectively, and the average GW flow increased by 6.72%, 2.90%, and 6.83%, respectively, and the average GW reserves decreased by 14.80%, 11.39%, and 7.67%, respectively. Therefore, this study believed that changes of LULC have led to a significant decrease in runoff and an increase in evapotranspiration in the basin.

scholarly journals SIMULAÇÃO HIDROLÓGICA FERRAMENTA PARA GESTÃO DOS RECURSOS HÍDRICOS EM FUNÇÃO DE MUDANÇAS CLIMÁTICAS NA BACIA DO RIO RIACHÃO, MG, BRASIL

Nativa ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 718
Author(s):  
Rafael Alexandre Sá ◽  
Marcos Koiti Kondo ◽  
Edson De Oliveira Vieira ◽  
Silvânio Rodrigues Dos Santos ◽  
Nayara Paula Andrade Vieira ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
River Basin ◽  
Air Temperature ◽  
Water Availability ◽  
Swat Model ◽  
Minas Gerais ◽  
Hydrologic Model ◽  
Hydrological Simulation ◽  
The Impact

A simulação hidrológica de bacias hidrográficas tem se tornado uma ferramenta importante de planejamento e gestão de recursos hídricos, projetando-se inclusive a disponibilidade hídrica a partir das mudanças climáticas. Dessa forma, objetivou-se avaliar a eficiência do modelo hidrológico SWAT na simulação da vazão da bacia hidrográfica do rio Riachão, no Norte de Minas Gerais, sob impacto de cenários alternativos de elevação da temperatura média do ar. O modelo SWAT foi ajustado para o período de 01/01/2008 a 31/12/2014 e calibrado com os dados das vazões hidrometradas obtendo valores do coeficiente de eficiência Nash-Sutcliffe (NSE) de 0,74 e 0,79 e tendência percentual (PBIAS) 15,45% e 16,72%, nas fases de calibração e validação, respectivamente. A disponibilidade de água superficial da bacia hidrográfica para comparação dos cenários foi calculada por meio da curva de permanência da vazão de referência Q90, obtendo-se o valor de 0,081 m3 s-1 para o modelo calibrado. Os cenários de aumento da temperatura média da bacia em 1,5; 2,0; 3,0; 4,0 e 5,0 °C levaram ao decréscimo da Q90 em 7,66; 8,98; 10,49; 14,06 e 17,76%, respectivamente.Palavras-chave: escoamento superficial; modelo SWAT; cenários climáticos; gerenciamento de recursos hídricos. HYDROLOGICAL SIMULATION TOOL FOR MANAGEMENT OF WATER RESOURCES IN THE FUNCTION OF CLIMATE CHANGE IN THE RIACHÃO RIVER BASIN, MG, BRAZIL ABSTRACT: The hydrological simulation of watersheds becomes a major tool for planning and management of water resources, including water availability prediction from global climate change. Thus, the objective was to evaluate the efficiency of the SWAT hydrologic model to simulate the stream flow of Riachão river basin, North of Minas Gerais State, Brazil, under the impact of alternative scenarios with the increase in mean surface air temperature. The SWAT model was adjusted for 1/1/2008 to 12/31/2014 period and calibrated with data measurement obtaining values the Nash-Sutcliffe efficiency (NSE) of 0.74 and 0.79 and percent bias (PBIAS) of 15.45 and 16.72% was found to calibration and validation period, respectively. The surface water availability in the hydrographic basin was calculated by Q90 streamflow, with calibrated value of 0.081 m³s-1. The scenarios of increase in mean air temperature (1.5, 2.0, 3.0, 4.0 and 5.0 ºC) reduced Q90 by 7.66, 8.98, 10.49, 14.06 and 17.76%, respectively.Keywords: runoff; SWAT model; climate scenarios; water resource management.

scholarly journals Local climate change projections and impact on the surface hydrology in the Vea catchment, West Africa

2021 ◽  
Author(s):  
Isaac Larbi ◽  
Fabien C. C. Hountondji ◽  
Sam-Quarcoo Dotse ◽  
Daouda Mama ◽  
Clement Nyamekye ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
West Africa ◽  
Surface Runoff ◽  
Swat Model ◽  
Northern Ghana ◽  
Water Yield ◽  
Mean Annual Temperature ◽  
Ensemble Mean ◽  
The Impact

Abstract Water security has been a major challenge in the semi-arid area of West Africa including Northern Ghana, where climate change is projected to increase if appropriate measures are not taken. This study assessed rainfall and temperature projections and its impact on the water resources in the Vea catchment using an ensemble mean of four bias-corrected Regional Climate Models and Statistical Downscaling Model-Decision Centric (SDSM-DC) simulations. The ensemble mean of the bias-corrected climate simulations was used as input to an already calibrated and validated Soil and Water Assessment Tool (SWAT) model, to assess the impact of climate change on actual evapotranspiration (ET), surface runoff and water yield, relative to the baseline (1990–2017) period. The results showed that the mean annual temperature and actual ET would increase by 1.3 °C and 8.3%, respectively, for the period 2020–2049 under the medium CO2 emission (RCP4.5) scenario, indicating a trend towards a dryer climate. The surface runoff and water yield are projected to decrease by 42.7 and 38.7%, respectively. The projected decrease in water yield requires better planning and management of the water resources in the catchment.

scholarly journals Analysing the Impact of Climate Change on Hydrological Ecosystem Services in Laguna del Sauce (Uruguay) Using the SWAT Model and Remote Sensing Data

2021 ◽  
Vol 13 (10) ◽  
pp. 2014
Author(s):  
Celina Aznarez ◽  
Patricia Jimeno-Sáez ◽  
Adrián López-Ballesteros ◽  
Juan Pablo Pacheco ◽  
Javier Senent-Aparicio
Keyword(s):  
Climate Change ◽  
Remote Sensing ◽  
Ecosystem Services ◽  
Water Resources ◽  
Swat Model ◽  
Remote Sensing Data ◽  
Erosion Control ◽  
Sensing Data ◽  
Extreme Precipitation Events ◽  
The Impact

Assessing how climate change will affect hydrological ecosystem services (HES) provision is necessary for long-term planning and requires local comprehensive climate information. In this study, we used SWAT to evaluate the impacts on four HES, natural hazard protection, erosion control regulation and water supply and flow regulation for the Laguna del Sauce catchment in Uruguay. We used downscaled CMIP-5 global climate models for Representative Concentration Pathways (RCP) 2.6, 4.5 and 8.5 projections. We calibrated and validated our SWAT model for the periods 2005–2009 and 2010–2013 based on remote sensed ET data. Monthly NSE and R2 values for calibration and validation were 0.74, 0.64 and 0.79, 0.84, respectively. Our results suggest that climate change will likely negatively affect the water resources of the Laguna del Sauce catchment, especially in the RCP 8.5 scenario. In all RCP scenarios, the catchment is likely to experience a wetting trend, higher temperatures, seasonality shifts and an increase in extreme precipitation events, particularly in frequency and magnitude. This will likely affect water quality provision through runoff and sediment yield inputs, reducing the erosion control HES and likely aggravating eutrophication. Although the amount of water will increase, changes to the hydrological cycle might jeopardize the stability of freshwater supplies and HES on which many people in the south-eastern region of Uruguay depend. Despite streamflow monitoring capacities need to be enhanced to reduce the uncertainty of model results, our findings provide valuable insights for water resources planning in the study area. Hence, water management and monitoring capacities need to be enhanced to reduce the potential negative climate change impacts on HES. The methodological approach presented here, based on satellite ET data can be replicated and adapted to any other place in the world since we employed open-access software and remote sensing data for all the phases of hydrological modelling and HES provision assessment.

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