scholarly journals BEBERAPA SKENARIO PENGGUNAAN LAHAN UNTUK PERBAIKAN KONDISI HIDROLOGI DI DAERAH ALIRAN SUNGAI CIDURIAN (Land use scenarios for hydrological conditions improvement in Cidurian Watershed)

2021 ◽  
Vol 5 (2) ◽  
pp. 121-140
Author(s):  
Kartika Triasary ◽  
◽  
Muhammad Yanuar Jarwadi Purwanto ◽  
Suria Darma Tarigan ◽  
◽  
...  
Keyword(s):  
Land Use ◽  
Assessment Tool ◽  
Hydrological Conditions ◽  
Land Use Scenarios ◽  
Water Assessment ◽  
Soil And Water

Daerah Aliran Sungai (DAS) Cidurian merupakan salah satu DAS di Pulau Jawa dengan kategori sebagai DAS yang dipulihkan. Kinerja DAS Cidurian secara umum dari hulu sampai dengan hilir termasuk dalam klasifikasi kategori buruk. Penelitian ini bertujuan untuk 1) mengkaji karakteristik hidrologi DAS Cidurian menggunakan model hidrologi SWAT; 2) mengkaji kinerja hidrologi berdasarkan skenario simulasi yang disusun; dan 3) menyusun strategi keberhasilan Rehabilitasi Hutan dan Lahan pada DAS Cidurian berdasarkan skenario terbaik. Berbagai skenario penggunaan lahan dan pengelolaannya diujicobakan menggunakan model SWAT (Soil and Water Assessment Tool) untuk menduga dampak penerapannya terhadap karakteristik hidrologi pada DAS Cidurian. Skenario yang diaplikasikan adalah sebagai berikut: 1) Implementasi RTRW (Rencana Tata Ruang Wilayah) Provinsi Banten dan Jawa Barat; 2) Implementasi Rehabilitasi Hutan dan Lahan dengan penanaman penanaman vegetative dan; 3). Implementasi Rehabilitasi Hutan dan Lahan penanaman vegetatif dan Konservasi Tanah dan Air secara vegetatif dan sipil teknis. Kalibrasi dan validasi dari model menunjukkan kategori memuaskan dengan nilai NSE (Nash-Sutcliffe Efficiency) 0,53 dan 0,50. Semua skenario menunjukkan peningkatan respon hidrologi dibandingkan dengan kondisi eksisting tahun 2020. Ketiganya memberikan respon limpasan permukaaan dan hasil sedimen yang menurun serta aliran lateral dan aliran dasar yang meningkat. Semua skenario ini menurunkan nilai Koefisien Aliran Tahunan (KAT) dan Koefisien Regim Aliran (KRA). Skenario penerapan kombinasi Rehabilitasi Hutan dan Lahan penanaman vegetatif dan Konservasi Tanah dan Air menjadi skenario terbaik dengan nilai KAT 0,27 (kategori rendah) dan KRA 22,40 (kategori rendah).

scholarly journals Calibração hidrológica do modelo SWAT em bacia hidrográfica caracterizada pela expansão do cultivo da cana-de-açúcar

2020 ◽  
Vol 13 (2) ◽  
pp. 576
Author(s):  
Letícia Lopes Martins ◽  
Wander Araújo Martins ◽  
Jener Fernando Leite De Moraes ◽  
Mário José Pedro Júnior ◽  
Isabella Clerici De Maria
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Model Calibration ◽  
Assessment Tool ◽  
Swat Model ◽  
Sao Paulo ◽  
São Paulo ◽  
Calibration And Validation ◽  
Water Assessment ◽  
Soil And Water

A dificuldade na gestão de recursos hídricos aliada à dinâmica do uso e ocupação do solo em bacias hidrográficas agrícolas são fatores relevantes para a conservação da água e solo. A gestão de bacias hidrográficas, bem como o monitoramento de cenários de expansão agrícola e mudança no uso do solo, podem se beneficiar de ferramentas de modelagem hidrossedimentológica, como o SWAT (Soil and Water Assessment Tool). Entretanto, para que os resultados obtidos sejam confiáveis, os modelos precisam ser calibrados. Objetivou-se, neste trabalho, calibrar e validar o modelo SWAT, para a variável vazão, tendo como base a bacia hidrográfica do Ribeirão do Pinhal, Limeira -São Paulo, que se caracteriza pela expansão da cana-de-açúcar sobre áreas citrícolas. Dados de vazão de um posto fluviométrico localizado no exutório da bacia foram utilizados para a calibração e validação, a partir de séries temporais diferentes.  Utilizou-se o software QSWAT para a simulação hidrológica e o SWAT-CUP para a calibração e validação do modelo. O modelo foi calibrado e validado resultando nos seguintes índices estatísticos NSE=0,64; PBIAS=15,2 e RSR=0,60 para calibração e NSE=0,68 PBIAS=-2,8 e RSR=0,56 para a validação. O ajuste de parâmetros do SWAT (USLE_P, USLE_C, CN2) e do calendário de operações da cana-de-açúcar em acordo com a situação real da bacia foi necessário para a calibração do modelo. Os resultados indicam que o modelo SWAT subestima as vazões extremas, no entanto, dentro de faixa aceitável. O SWAT, após a calibração, pode ser utilizado na gestão de recursos hídricos na bacia do Ribeirão do Pinhal.Hydrological calibration of the SWAT model in a watershed characterized by the expansion of sugarcane cultivationA B S T R A C TThe difficulty in water resources management combined with the dynamics of land use and occupation in agricultural watersheds are relevant factors for water and soil conservation. River basin management, as well as monitoring scenarios of agricultural expansion and land-use change, can benefit from hydrossedimentological modeling tools such as the SWAT (Soil and Water Assessment Tool). However, for the results to be reliable, the models must be calibrated. The objective of this study was to calibrate and validate the SWAT model for the flow variable, based on the Ribeirão do Pinhal watershed, Limeira-São Paulo, which is characterized by the expansion of sugarcane over citrus areas. Flow data from a fluviometric station located in the basin's outfall were used for calibration and validation from different time series. QSWAT software was used for hydrological simulation and SWAT-CUP for model calibration and validation. The model was calibrated and validated resulting in the following statistical indices NSE = 0.64; PBIAS = 15.2 and RSR = 0.60 for calibration and NSE = 0.68 PBIAS = -2.8 and RSR = 0.56 for validation. Adjustment of SWAT parameters (USLE_P, USLE_C, and CN2) and the sugarcane operation schedule according to the actual basin situation was necessary for model calibration. The results indicate that the SWAT model underestimates the extreme flow rates, however, within an acceptable range. After calibration, the SWAT can be used to manage water resources in the Ribeirão do Pinhal basin.Keywords: Hydrologic simulation; land use; flow rate.

scholarly journals Prediction of erosion and sedimentation rates using SWAT (soil and water assessment tool) method in Malino Sub Watershed Jeneberang Watershed

2021 ◽  
Vol 886 (1) ◽  
pp. 012103
Author(s):  
Andang Suryana Soma ◽  
Wahyuni ◽  
Musdalifah
Keyword(s):  
Land Use ◽  
Spatial Distribution ◽  
Sedimentation Rate ◽  
Erosion Rate ◽  
Agricultural Land ◽  
Assessment Tool ◽  
Sedimentation Rates ◽  
Watershed Land Use ◽  
Water Assessment ◽  
Soil And Water

Abstract The increase in population will encourage the community to transfer the function of agricultural land in the Malino sub-watershed. Land use dramatically affects the level of erosion and sedimentation. The use of SWAT models can identify, assess, and evaluate the extent of a watershed’s problems. This study aims to determine the spatial distribution of HRU and analyze the rate of erosion and sedimentation in the Malino sub-watershed. The results showed that the most HRU is found in secondary dryland forests, as much as 624 HRU (32.21%). The level of erosion rate of the category is very light with an erosion value of 5.21 tons/ha/year, light 31.19 tons/ha/year, moderate 104.91 tons/ha/year, weight 267.10 tons/ha/year, and hefty 616.74 tons/ha/year. The most significant sedimentation rate was found in sub-watershed 18 of 71.97 tons/ha/year and subwatershed 10 of 13.31 tons/ha/year.

scholarly journals Avaliação de Impactos de Mudanças no Uso e Manejo do Solo Sobre as Vazões da Bacia Hidrográfica do Ribeirão José Pereira, Utilizando o Modelo Swat.

2021 ◽  
Vol 14 (2) ◽  
pp. 619
Author(s):  
Filipe Otávio Passos ◽  
Benedito Cláudio Da Silva ◽  
Fernando Das Graças Braga da Silva
Keyword(s):  
Land Use ◽  
Hydrological Modeling ◽  
Assessment Tool ◽  
Swat Model ◽  
Water Source ◽  
Distributed Model ◽  
Small Scale ◽  
The Impact ◽  
Water Assessment ◽  
Soil And Water

Diversos processos naturais podem causar mudanças nos fluxos hidrológicos dentro de bacias hidrográficas, sendo estas ainda mais afetadas devido a ações antrópicas que mudem as suas características físicas, principalmente, o tipo e o uso do solo. Neste contexto, este trabalho apresenta uma calibração de um modelo de transformação chuva x vazão e posterior simulação para a estimativa das vazões na bacia hidrográfica do ribeirão José Pereira, em Itajubá, sul de Minas Gerais, utilizando o modelo distribuído Soil and Water Assessment Tool (Swat). Foram gerados cinco cenários de uso e ocupação do solo, que foram idealizados a partir de características observadas na bacia ou de tendências futuras de ocupação, a saber, o cenário do estado atual, de manejo do solo, de recuperação das áreas de preservação permanente (APPs) de margens de rios, de substituição total por floresta e de crescimento urbano. Os resultados indicam que o modelo Swat pode ser utilizado na simulação das componentes hidrológicas de bacias hidrográficas de pequeno porte, e ainda que o manejo agrícola e o reflorestamento da bacia são mais eficientes na diminuição do escoamento superficial do que a recuperação das APPs, chegando a uma diminuição de aproximadamente 40% nas vazões máximas simuladas. Impact Assessment of Changes in Land Use and Management on the Losses of the Water Source of the José Pereira Stream, Using the SWAT Model A B S T R A C TSeveral natural processes can cause changes in hydrological flows within hydrographic basins, which are even more affected due to anthropic actions that change their physical characteristics, mainly, the type and use of the soil. In this context, this work carries out an analysis of the impact on the flows of a small-scale hydrographic basin (River José Pereira) due to changes in land use and occupation, using the distributed model Soil and Water Assessment Tool (SWAT). Five land use and occupation scenarios were generated, which were designed based on characteristics observed in the basin or future occupation trends, namely, the current state scenario, soil management, recovery of permanent preservation areas (APPs) of river banks, total replacement by forest and urban growth. The results indicate that the SWAT model can be used in the simulation of the hydrological components of small hydrographic basins, and that agricultural management and reforestation of the basin are more efficient in reducing runoff than the recovery of APPs, reaching a decrease of approximately 40% in the maximum simulated flows.Keywords: hydrological modeling, rainfall, SWAT, land use and occupation.

scholarly journals Pemodelan Perubahan Tataguna Lahan Terhadap Debit Banjir DAS Tanggul, Jember Menggunakan Model SWAT (Soil and Water Assessment Tool)

2020 ◽  
Vol 14 (2) ◽  
pp. 154-161
Author(s):  
Diah Ainunisa ◽  
◽  
Gusfan Halik ◽  
Wiwik Yunarni Widiarti ◽  
◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Rainy Season ◽  
Model Calibration ◽  
Assessment Tool ◽  
Swat Model ◽  
Land Use Changes ◽  
Forest Land ◽  
Water Assessment ◽  
Soil And Water

Population growth is one of the causes of land-use change that can increase runoff. Tanggul watershed is one of the watersheds which often overflows during the rainy season. This study purpose to analyze the effect of land-use changes on runoff in Tanggul watershed using SWAT (Soil and Water Assessment Tool) model. To make sure the performance of SWAT model calibration and classified by the value of NSE and R2. The result of calibration included in a good category and validation included in a very good category. This study was modeling forest land-use change in 2004-2017 to determine the effect of land-use change on runoff. The result in this model of forest land-use change can increase runoff.

Land use planning based on soil and water assessment tool model in a mountainous watershed to reduce runoff and sediment load

2019 ◽  
Vol 99 (3) ◽  
pp. 305-320 ◽  
Author(s):  
Mohammad Hossein Hemmat Jou ◽  
Davood Namdar Khojasteh ◽  
Ali Asghar Besalatpour
Keyword(s):  
Land Use ◽  
Assessment Tool ◽  
Central Iran ◽  
Land Evaluation ◽  
Productive Capacity ◽  
Time Step ◽  
Strong Basis ◽  
Sediment Yields ◽  
Water Assessment ◽  
Soil And Water

Soil erosion is a major environmental threat to the sustainability and productive capacity of soils. This study aimed to identify optimal land use types for Zayandehrood watershed in central Iran for the first time which is large and mountainous to minimize runoff production and soil loss. Two different types of land use data for two scenarios were developed using soil and water assessment tool (SWAT) in combination with Sequential Uncertainty Fitting Program (SUFI-2) at the subbasin level with uncertainty analysis to explicitly quantify hydrological components on a daily time step. In the first scenario, the current land use map of the study area was used, and the second scenario was constructed using an optimal land use map obtained from a land evaluation study. Promotion of the land uses in the second scenario resulted in a noticeable reduction in discharge and sediment productions in the watershed. The simulated mean discharge values by the scenarios 1 and 2 were approximately 14 658 and 13 290 m3 yr−1, respectively. The mean annual sediment yield simulated by the scenario 1 (approximately 122 220 t yr−1) decreased to that of the scenario 2 (94 440 t yr−1). This study provides a strong basis for reducing runoff and sediment yields in central Iran; however, its general analytical framework could be applied to other parts of the world that are facing similar challenges.

scholarly journals Estimativa da produção de sedimentos em função da mudança de uso e cobertura do solo

2014 ◽  
Vol 18 (2) ◽  
pp. 199-201 ◽  
Author(s):  
Caroline A. Galharte ◽  
João M. Villela ◽  
Silvio Crestana
Keyword(s):  
Land Use ◽  
Assessment Tool ◽  
Eucalyptus Grandis ◽  
Small Region ◽  
Eucalyptus Urophylla ◽  
A Posteriori ◽  
Water Assessment ◽  
Soil And Water

Os processos de mudança de uso e cobertura do solo despertam grande preocupação quanto a se compreender e melhor planejá-los a fim de evitar impactos, como perda da biodiversidade, erosão do solo e contaminação dos recursos hídricos. O trabalho propõe estimar a produção de sedimentos em cenários da microbacia hidrográfica do ribeirão das Guabirobas, localizada no município de São Carlos, SP. Para isto foi aplicado o modelo de simulação espacial CLUE-S (Conversion of Land Use and its Effects at Small Region Extent), com o objetivo de gerar cenários para o ano de 2025 da área de estudo. A posteriori, foi estimada a produção de sedimentos desses cenários com o auxílio do modelo de simulação SWAT (Soil and Water Assessment Tool). Dois cenários foram simulados: expansão da cana-de-açúcar e expansão da laranja. Por meio das diferentes demandas por áreas inseridas no CLUE-S foi possível gerar cenários da microbacia hidrográfica do ribeirão das Guabirobas para o ano de 2025 e, com o auxílio do SWAT, estimar a produção de sedimentos nos diferentes usos do solo e verificar que a cultura da cana-de-açúcar de variedades RB72-454, CTC6 e CTC11 e do híbrido entre Eucalyptus grandis e Eucalyptus urophylla foi mais significativa.

scholarly journals Modeling Landscape Change Effects on Stream Temperature Using the Soil and Water Assessment Tool

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1143 ◽  
Author(s):  
Mamoon Mustafa ◽  
Brad Barnhart ◽  
Meghna Babbar-Sebens ◽  
Darren Ficklin
Keyword(s):  
Land Use ◽  
Radiative Forcing ◽  
Assessment Tool ◽  
Stream Temperature ◽  
Radiative Heat Exchange ◽  
Extended Model ◽  
Temperature Model ◽  
Time Step ◽  
Water Assessment ◽  
Soil And Water

Stream temperature is one of the most important factors for regulating fish behavior and habitat. Therefore, models that seek to characterize stream temperatures, and predict their changes due to landscape and climatic changes, are extremely important. In this study, we extend a mechanistic stream temperature model within the Soil and Water Assessment Tool (SWAT) by explicitly incorporating radiative flux components to more realistically account for radiative heat exchange. The extended stream temperature model is particularly useful for simulating the impacts of landscape and land use change on stream temperatures using SWAT. The extended model is tested for the Marys River, a western tributary of the Willamette River in Oregon. The results are compared with observed stream temperatures, as well as previous model estimates (without radiative components), for different spatial locations within the Marys River watershed. The results show that the radiative stream temperature model is able to simulate increased stream temperatures in agricultural sub-basins compared with forested sub-basins, reflecting observed data. However, the effect is overestimated, and more noise is generated in the radiative model due to the inclusion of highly variable radiative forcing components. The model works at a daily time step, and further research should investigate modeling at hourly timesteps to further improve the temporal resolution of the model. In addition, other watersheds should be tested to improve and validate the model in different climates, landscapes, and land use regimes.

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