International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 05 | May 2024
p-ISSN: 2395-0072
www.irjet.net
URBAN FLOOD MODELING USING ARCSWAT: MANGALURU Jeevitha R 1 And Dr Rekha H B 2 1 Mtech Student, Department of Civil Engineering, University of Visvesvaraya Collage of Engineering, Bangalore,
India
2Assosiate Professor, 1Department of Civil Engineering, University of Visvesvaraya Collage of Engineering,
Bangalore, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Detailed descriptions and models of the affected metropolitan areas are used to calculate and anticipate the impacts
of urbanization on the hydrological procedure as well as water resources. The Water & Soil Analysis (ArcSWAT) model was chosen to test its applicability in the water-scarce city of Mangaluru, India. The primary aim of this project is to find out the rainfall simulation in Mangaluru city and find the flood zone for the study. The catchment area of Mangaluru city is immeasurable. Therefore, a regionalization approach was adopted to estimate the basin outlet flow. Validation and calibration of the SUFI-2 algorithm for the flow process using SWATCUP2012 was performed monthly. The model has been evaluated along validated by comparing observed and simulated water fluxes from the outlet from 1991 to 2015 and 2015 to 2022, respectively. SWATCUP results show a good match among simulated along with observed flow. In summary, urban development can affect runoff, in the research area. Research shows that greater attention should be paid to flood prevention and management of water when planning future urban growth in the region. Key Words: Urbanization, ArcSWAT, SWAT CUP, Calibration, Validation
1.INTRODUCTION Urban watershed hydrology or hydrological procedures in the urbanized watersheds is one of the various sub-branches of hydrological science that has become clearly important in recent years. As per the WMO (World Meteorological Organization), floods are the third largest catastrophic event in history. According to the Federal Emergency Management Agency (FEMA), flooding is defined as dry land being covered by water. Urban flooding occurs when surface runoff exceeds the capacity of municipal water systems (Nie, 2014). As the impermeable surface increases due to urban development and climate change, floods also increase. The risk of floods is rising because of the effects of urbanization as well as changes in climate. Urban climate increases resulting from changes in land use in urban areas have a negative impact on urban residents and infrastructure. Impacts include destruction of habitats and variations in the quality & quantity of precipitation, leading to alterations in water quality (Jacobson, 2011). According to statistics, since 2009, over half of all people on Earth have made the transition to city living, marking a milestone in human history. Furthermore, population forecasts indicate that by 2030, growth and migration, particularly in large cities and wealthy nations, would push the urban population to over 80% of the overall population. Population growth and urbanization cause environmental impacts and often affect the sustainability of water resources (Ermias Sisay, 2017). Urban flood research has been conducted worldwide for many years and results in a wide range of mathematical tools, both free and proprietary. Graphical user interfaces (GUIs) have made it possible for programs like SWAT, SWMM, HEC-RAS, HECHMS, MIKE FLOOD, etc. Urban flood modelling software such as has also become widespread. The outputs that can be produced by software have become increasingly easier to understand. GIS software such as QGIS and ArcGIS makes it easy to capture and enter data directly into the model. (Vinay Ashok Rangari, 2020). This study's main objective is to determine the rainfall-runoff simulation in Mangaluru city using ArcSWAT. SWAT, is a computer-friendly hydrological model utilized to simulate the flow of water in rivers. An interface among ArcGIS and the SWAT framework has been employed recently: ArcSWAT, a third-party software extension for ArcGIS.
2. MATERIAL AND METHOD 2.1 Description of Study Area Mangaluru is the capital of Dakshina Kannada district and the main port city of Karnataka, known as the gateway to Karnataka. It is the fourth largest city in the state. It is located at 12°52' latitude and 74°53' longitude. The city is situated on the country’s
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