scholarly journals SIMULAÇÃO DA VAZÃO MÁXIMA PELO MÉTODO DE VEN TE CHOW (SCS) EM BACIAS HIDROGRÁFICAS URBANIZADAS DE MARECHAL CÂNDIDO RONDON, PARANÁ / SIMULATION OF PEAK DISCHARGE FROM URBAN WATERSHEDS AT MARECHAL CÂNDIDO RONDON (BRAZIL) USING VEN TE CHOW METHOD

2019 ◽  
Vol 4 (2) ◽  
pp. 246
Author(s):  
Oscar Vicente Quinonez Fernandez
Keyword(s):  
Surface Runoff ◽  
Soil Conservation ◽  
Hydrological Model ◽  
Simulation Method ◽  
Return Time ◽  
Peak Discharge ◽  
Soil Conservation Service ◽  
Western Region ◽  
Impervious Area ◽  
Direct Association

O incremento da urbanização tem causado alterações hidrológicas nas bacias hidrográficas acarretando aumento de enchentes e alagamentos. O objetivo do trabalho é estimar a vazão máxima no exutório das bacias que drenam a área urbana de Marechal Cândido Rondon, Oeste do Paraná. O método empregado é o ven te Chow – Soil Conservation Service (SCS), um modelo hidrológico de transformação de chuvas em vazões. As bacias estudadas foram: Peroba, cabeceira do Guavirá, Bonito, Guará, Matilde-cuê, Borboleta e Apepu. As vazões máximas foram simuladas para diversos tempo de duração da chuva e tempo de retorno da precipitação de 2, 5, 10 e 20 anos. A área de drenagem das bacias variou de 5,01 km2 (Bonito) a 16,23 km2 (Guará) e a área impermeabilizada variou de 8,30 % (Peroba) a 63,83 % (Matilde-cuê), conforme mapa de uso da terra realizado com imagens orbitais obtidas em 2013. Foi constatado que as vazões máximas simuladas não apresentaram uma associação direta com a urbanização, sugerindo a maior influência das características morfométricas e pedológicas das bacias na geração do escoamento superficial.ABSTRACTThe increase in urbanization has caused hydrological changes in the watersheds, resulting in flooding. The objective of this work is to estimate the peak discharge in the watersheds that drain the urban area of Marechal Cândido Rondon, Western region of Paraná state, Brazil. The method used is the ven te Chow - Soil Conservation Service (SCS), a hydrological model for transforming rainfall into surface runoff. The watersheds studied were: Peroba, headwaters of Guavirá, Bonito, Guará, Matilde-cuê, Borboleta and Apepu. The peaks discharges were simulated for several rain duration times and rainfall return time of 2, 5, 10 and 20 years. The drainage area ranged from 5.01 km2 (Bonito) to 16.23 km2 (Guará) and the impervious area ranged from 8.30% (Peroba) to 63.83% (Matilde-cuê), according to the land use made with orbital images obtained in 2013. It was verified that the peak discharge simulated did not present a direct association with the urbanization, suggesting the greater influence of the morphometric and pedological characteristics of the watersheds in the generation of the surface runoff.Keywords: Urbanization; Floods; Simulation method of discharges.

scholarly journals ASSESSING THE IMPACT OF URBANIZATION ON DIRECT RUNOFF IN DISTRICT 8, HO CHI MINH CITY

2021 ◽  
Vol 11 (3) ◽  
pp. 145-156
Author(s):  
Van Minh NGUYEN ◽  
Elena Yurievna ZAYKOVA
Keyword(s):  
Remote Sensing ◽  
Surface Runoff ◽  
Soil Conservation ◽  
Curve Number ◽  
Ho Chi Minh City ◽  
Soil Conservation Service ◽  
Impact Of Urbanization ◽  
Service Curve ◽  
The Impact ◽  
Scs Cn

Ho Chi Minh City (HCMC) is among the cities that are most at risk of fl ooding worldwide. Urbanization processes have led to a change in land use, which in turn has resulted in an increase in impervious surfaces and runoff , thus again leading to the risk of fl ooding in the city. The aim of the article is to study the impact of urban development (on the example of District 8 of HCMC) on surface runoff using a combination of the interpretation of remote sensing images of the earth (ERS) Google Earth and the SCS-CN model (the Soil Conservation Service curve number). Theoretical models are used to analyze the relationship between the typology of buildings and areas of open and impervious surfaces. The interpretation of remote sensing images was carried out in the ArcGIS program. The method used to calculate surface runoff is the Soil Conservation Service Curve Number (SCS-CN) method developed by the US Soil Conservation Service and is suitable for assessing the eff ects of land-use/land cover change due to urbanization. The results of the study show the volume of surface runoff in areas with diff erent levels of urbanization in district 8 of HCMC, assessing the impact of urbanization processes on surface runoff and revealing new opportunities for managing this process. The combination of remote sensing interpretation and SCS-CN model makes it possible to assess the impact of urban development on surface runoff . Urbanization and an increase in built-up area strongly aff ect fl ooding, reducing the soil retention.

scholarly journals Analisis dan Pemetaan Limpasan Permukaan di DAS Citanduy Hulu dengan Metode SCSN

2021 ◽  
Vol 14 (1) ◽  
pp. 73-86
Author(s):  
Asep Kurnia Hidayat ◽  
Pengki Irawan ◽  
Jaza'ul Ikhsan ◽  
Sri Atmadja ◽  
Novia Komala Sari
Keyword(s):  
Surface Runoff ◽  
Soil Conservation ◽  
Curve Number ◽  
Soil Conditions ◽  
Soil Conservation Service ◽  
Soil Group ◽  
Flood Discharge ◽  
Main River ◽  
Class B ◽  
Maximum Runoff

Abstrak. DAS Citanduy merupakan salah DAS yang terbesar di pulau Jawa dengan sungai utama adalah Cintanduy. DAS Citanduy terdiri dari beberapa sub DAS, salah satunya adalah sub DAS Citanduy Hulu. Perubahan tata guna lahan di DAS Citanduy Hulu terus terjadi, kondisi tsb telah mengakibatkan peningkatan debit banjir di sungai. Peningkatan debit di sungai diakibatkan adanya limpasan permukaan akibat hujan. limpasan permukaan dapat dianalisis menggunakan metode SCS (Soil Conservation Service). Metode SCS juga dianalisis berdasarkan kondisi tanah, sehingga dapat menentukan nilai Curve Number (CN) dari lahan. Hasil analisis tahun 2018, menunjukkan bahwa tutupan lahan 18,99% atau 13.735,97 ha berupa hutan (hutan primer, sekunder dan hutan tanaman). Sebaran jenis tanah di umumnya adalah Typic Dystrudepts (36,57%) dan Typic Hapludands (37,93%). Hydrological Soil Group (HSG) di DAS Citanduy Hulu didominasi oleh klas B sebesar 76, 92 %. Hasil analisis didapatkan bahwa DAS Citanduy Hulu tebal runoff maksimum pada PUH 2, 5, 10, 25, dan 50 tahun secara berurutan adalah 104 mm, 133 mm, 147 mm, 171 mm dan 187 mm. Tebal limpasan permukaan minimum dengan PUH 2, 5, 10, 25 dan 50 tahun secara berurutan adalah 17 mm, 31 mm, 39 mm, 53 mm dan 64 mm. Tebal limpasan permukaan menunjukkan potensi peningkatan debit banjir.Analysis And Mapping Runoff In Watershed Upper Citanduy With SCSN MethodAbstract. Citanduy watershed is one of the largest watersheds on the island of Java with the main river being Cintanduy. The Citanduy watershed consists of several sub-watersheds, one of which is the Upper Citanduy sub-watershed. Changes in land use in the Upper Citanduy watershed continue to occur, this condition has resulted in an increase in flood discharge in the river. The increase in discharge in the river is caused by surface runoff due to rain. Surface runoff can be analyzed using the SCS (Soil Conservation Service) method. The SCS method is also analyzed based on soil conditions so that it can determine the Curve Number (CN) value of the land. The results of the 2018 analysis show that 18.99% or 13,735.97 ha of land cover is forest (primary, secondary and plantation forests). The distribution of soil types, in general, is Typic Dystrudepts (36.57%) and Typic Hapludands (37.93%). Hydrological Soil Group (HSG) in the Upper Citanduy watershed is dominated by class B by 76.92%. The results of the analysis showed that the maximum runoff thickness of the Upper Citanduy Watershed at PUH 2, 5, 10, 25, and 50 years respectively was 104 mm, 133 mm, 147 mm, 171 mm, and 187 mm. The minimum surface runoff thickness with PUH 2, 5, 10, 25, and 50 years respectively is 17 mm, 31 mm, 39 mm, 53 mm, and 64 mm. The thickness of the surface runoff indicates the potential for increased flood discharge.

scholarly journals Analysis of Runoff Curve Number Distribution into Surface Runoff of Lesti Watershed

2021 ◽  
Vol 004 (01) ◽  
pp. 062-075
Author(s):  
Didit Priambodo ◽  
Ery Suhartanto ◽  
Sumiadi Sumiadi
Keyword(s):  
Land Use ◽  
Surface Runoff ◽  
Soil Conservation ◽  
Land Use Changes ◽  
Curve Number ◽  
Soil Conservation Service ◽  
Residential Areas ◽  
Conservation Treatment ◽  
Number Distribution ◽  
Sediment Loads

Lesti watershed is a sub basin of Brantas River located in Malang Regency, which is the main source of inflow and sediment loads for the Sengguruh Dam. Human activities change the type of land cover by deforestation for the expansion of agricultural and residential areas. It makes a rapid increasing of runoff and discharges that were potentially carrying sediment into Lesti River. To measure surface runoff in a watershed can be held by modeling rather than directly in the field, it is cheaper and more effective with accurate results. This study is based on Soil Conservation Service (SCS) formula to illustrate surface runoff level by knowing curve number distribution. Using models based on land use changes in 2010, 2012 and 2017, generated by AV SWAT software, shows that increasing CN value each year affects the surface runoff, so there is a relationship between land use and runoff. The average CN value in 2010 is 63.644, 2012 is 63.942, 2017 is 65.49, while the average surface runoff in 2010 is 800.28, 2012 is 823.26, 2017 is 828.009. Conservation treatment on the area with a high CN value can reduce the surface runoff. It shows that watershed performance is getting better

scholarly journals Modelling surface runoff using the soil conservation service-curve number method in a drought prone agro-ecological zone in Rwanda

2019 ◽  
Vol 7 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Dieudonne Uwizeyimana ◽  
Stephen M. Mureithi ◽  
Simon M. Mvuyekure ◽  
George Karuku ◽  
Geoffrey Kironchi
Keyword(s):  
Surface Runoff ◽  
Soil Conservation ◽  
Curve Number ◽  
Soil Conservation Service ◽  
Ecological Zone ◽  
Curve Number Method ◽  
Service Curve

Determination of SCS-CN initial abstraction ratio in a catchment prone to flash floods

2020 ◽  
Vol 15 (1) ◽  
pp. 112-123 ◽  
Author(s):  
Martin Caletka ◽  
Monika Šulc Michalková
Keyword(s):  
Surface Runoff ◽  
Soil Conservation ◽  
Curve Number ◽  
Flash Floods ◽  
Soil Conservation Service ◽  
Initial Abstraction ◽  
Service Curve ◽  
Scs Cn ◽  
Proper Setting

Abstract The soil conservation service - curve number method is a globally used approach to simulations of surface runoff for its simplicity and applicability. Nevertheless, relevant simulations require proper setting of the model's components. This work focuses on optimization of initial abstraction ratio λ in the Husí potok sub-catchments in Czech Republic. Due to favorable morphology, the watershed is prone to flash floods and accurate modeling of surface runoff is of high interest. The analysis was conducted using pairs of discharge and rainfall measurements. The results outline that the traditional value λ= 0.2 is too high in this watershed and should be reduced.

scholarly journals ESTIMATIVAS DA VAZÃO MÁXIMA E CAPACIDADE DE SATURAÇÃO HÍDRICA DA BACIA HIDROGRÁFICA DO ALTO DO RIO LIGEIRO EM PATO BRANCO, PR

FLORESTA ◽  
2011 ◽  
Vol 41 (4) ◽  
Author(s):  
Andrea Sartori Jabur ◽  
Nivaldo Eduardo Rizzi
Keyword(s):  
Soil Conservation ◽  
Hydrological Model ◽  
Peak Flow ◽  
Water Saturation ◽  
Average Rate ◽  
Maximum Flow ◽  
Curve Number ◽  
Recurrence Time ◽  
Soil Conservation Service ◽  
Infiltration Basin

O objetivo deste artigo é a estimativa da vazão máxima com o uso do método da curva número desenvolvido pelo Soil Conservation Service (SCS), pelo uso da fórmula racional e da equação de Ven Te Chow, ambos métodos hidrológicos que transformam chuva em vazão, tendo como estudo de caso a bacia hidrográfica do alto do rio Ligeiro (1/3 superior). A bacia hidrográfica localiza-se no município de Pato Branco (latitude 26o09’52” Sul e longitude 52o41’44” Oeste) e apresenta uma área de 68,26 km2. Para obtenção do modelo hidrológico, foi necessária a confecção de mapas temáticos de uso do solo para os anos de 1980 e 2008. Nas condições de umidade normal (NII), tempo de recorrência de 10 anos, a vazão de pico (chuva 0,3h) elevou-se de 59,76 m3 em 1980 para 72,13 m3 em 2008. Essa vazão é consequência da impermeabilização da bacia no período e redução da área de cultivos agrícolas que, consequentemente, reduziram as taxas médias de infiltração da bacia (as áreas cultivadas em 1980 atingiam 70,63% do total da bacia e em 2008 foram reduzidas a um percentual de 51,98%).Palavras-chave: Hidrologia; bacia hidrográfica; rio Ligeiro; vazão e curva número. AbstractEstimates of maximum rate and water saturation capacity of Upper River Ligeiro watershed, in Pato Branco, PR. The aim of this paper is to estimate the maximum flow in Upper River Ligeiro watershed (1/3 higher) using the curve number method, developed by Soil Conservation Service (SCS), by the application of the rational formula and the Ven Te Chow equation, both hydrologic methods that transform rainfall into runoff. This watershed is located in Pato Branco (latitude 26º09'52" S and longitude 52º41'44" W) covering an area of 68.26 km2. In order to get the hydrological model it was necessary the preparation of thematic maps of land use for the years 1980 and 2008. Under normal humidity conditions (NII), recurrence time of 10 years, the peak flow (rainfall 0.3 m) increased from 59.76 m3 in 1980 to 72.13 m3 in 2008. This flow is due to the impermeability of the basin in the period and agricultural crops area reducing, which consequently reduced the average rate of infiltration basin (the cultivated areas in 1980 reached 70.63% of the total watershed and in 2008 were reduced to a percentage of 51.98%).Keywords: Hydrology; watershed; river Ligeiro; flow and curve number.

scholarly journals Assessing Matching Characteristics and Spatial Differences between Supply and Demand of Ecosystem Services: A Case Study in Hangzhou, China

Land ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 582
Author(s):  
Peng Tian ◽  
Jialin Li ◽  
Luodan Cao ◽  
Ruiliang Pu ◽  
Hongbo Gong ◽  
...  
Keyword(s):  
Land Use ◽  
Ecosystem Services ◽  
Urban Area ◽  
Food Supply ◽  
Soil Conservation ◽  
Supply And Demand ◽  
Water Yield ◽  
Western Region ◽  
Trade Offs ◽  
Carbon Retention

Ecosystem services (ESs) is a term used to describe the foundations of the well-being of human society, and several relevant studies have been carried out in this area. However, given the fact that the complex trade-offs/synergy relationships of ESs are a challenging area, studies on matching mechanisms for ES supply and demand are still rare. In this study, using the InVEST model, ArcGIS, and other professional tools, we first mapped and quantitatively evaluated the supply and demand of five ES types (water yield, soil conservation, carbon retention, food supply, and leisure and entertainment) in Hangzhou, China, based on land use, meteorology, soil, and socio-economic data. Then, we analyzed the matching characteristics between the supply and demand of these ESs and analyzed the complex trade-offs and synergy between the supply and demand of ESs and factors affecting ESs. The results of this analysis indicate that although the ES supply and demand of carbon retention tended to be out of balance (supply was less than demand), the supply and demand of the other four ES types (i.e., water yield, soil conservation, food supply, and leisure and entertainment) were in balance (supply exceeded demand). Finally, the spatial heterogeneity of the supply and demand of ESs in Hangzhou was significant, especially in urban areas in the northeast and mountainous areas in the southwest. The supply of ESs was based on trade-offs, whereas the demand of ESs was based on synergy. Our results further show that the supply and demand of ESs in the urban area in Hangzhou were out of balance, whereas the supply and demand of ESs in the western region were coordinated. Therefore, the linkage of ES flows between this urban area and the western region should be strengthened. This innovative study could provide useful information for regional land use planning and environmental protection.

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