Measuring Discharge in a Shallow River in an Arid Area solely using an Unmanned Aerial Vehicle

اکبرپور, فرهاد; خراسانی نژاد, محمدعادل; شهریاری, شروین; رحمان شاهی, مصطفی

doi:10.22077/jdcr.2024.7376.1061

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	Measuring Discharge in a Shallow River in an Arid Area solely using an Unmanned Aerial Vehicle
مجله پژوهش های خشکسالی و تغییراقلیم
دوره 2، شماره 2 - شماره پیاپی 6، شهریور 1403، صفحه 93-104 اصل مقاله (1.07 M)
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.22077/jdcr.2024.7376.1061
نویسندگان
فرهاد اکبرپور^* ¹؛ محمدعادل خراسانی نژاد²؛ شروین شهریاری³؛ مصطفی رحمان شاهی⁴
¹مهندس حفاظت از رودخانه، شرکت آب منطقه‌ای تهران، تهران، ایران.
²دانشجوی دکتری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران.
³دانش آموخته دکتری، موسسه مهندسی هیدرولیک و مدیریت منابع آب، دانشگاه صنعتی گراتس، اتریش.
⁴پژوهشگر پسادکتری، دانشگاه پلی‌تکنیک هنگ کنگ، هنگ کنگ.
چکیده
Unmanned Aerial Vehicles (UAVs) have recently been applied for river flow measurement. In this paper UAV images were first used to acquire surface velocity fields of a small river in an arid area in Iran based on the principles of Large Scale Particle Image Velocimetry (LSPIV). Subsequently, Large Eddy PIV method was applied on the instantaneous velocity data to obtain turbulent kinetic energy dissipation rates along a selected cross section of the experimented river. In addition, a UAV image was captured and processed to gain the bed material grain size distribution and consequently the Manning roughness coefficient. The resulted gradation curve matched the graph given by sieve analysis with an accuracy of nearly 7.8 percent. Moreover, an equation combining the acquired surface velocity, dissipation rates and Manning coefficient was used to estimate the river bathymetry. Although, the evaluated bathymetry does not fit the surveyed cross section very well, the average predicted depth matches the measured mean depth with a high precision. Finally, the river flow rate calculated using the information solely resulted from UAV images fitted the measured discharge with an accuracy of 5 percent proving the described framework to be a very effective method for primary river flow evaluation especially when supplementary depth measurement is not feasible.
کلیدواژه‌ها
Flow Rate؛ Large Scale Particle Image Velocimetry؛ UAVs؛ Arid areas؛ Large Eddy PIV

مراجع
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Measuring Discharge in a Shallow River in an Arid Area solely using an Unmanned Aerial Vehicle