نوع مقاله : مقاله پژوهشی

نویسندگان

• سعیده زمانی ¹
• مجید رحیم‌زادگان ²

¹ دانشجوی کارشناسی ارشد،گروه منابع آب، دانشکده عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی

² استادیار،گروه منابع آب، دانشکده عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی

چکیده

تبخیر از دریاچه پشت سدها و دریاچه‌های آب شیرین از جمله روش‌های هدررفت منابع آب است. به همین دلیل اندازه‌گیری مقدار تبخیر از سطح پهنه‌های آب شیرین اهمیت بسیاری در مدیریت منابع آب دارد. روش‌های گوناگونی برای اندازه‌گیری تبخیر-تعرق ارائه شده که از جمله آن‌ها الگوریتم توازن انرژی در سطح (SEBAL) است که می‌تواند با استفاده از تصاویر ماهواره‌ای نقشه‌های پهنه‌بندی تبخیر-تعرق تولید نماید. تا به حال، الگوریتم SEBAL بیشتر در برآورد تبخیر-تعرق از سطح خشکی‌ها و پوشش‌های گیاهی پیاده‌سازی شده و تحقیقات کمی در زمینه کاربرد آن در سطح پهنه‌های آبی شیرین انجام شده است. هدف این تحقیق، بکارگیری الگوریتم SEBAL جهت پهنه‌بندی تبخیر از سطح دریاچه‌های پشت سدها است. به همین منظور سه تصویر Landsat TM از دریاچه سد امیرکبیر (کرج) و زمین‌های کشاورزی پایین‌دست آن مربوط به ماه‌های خرداد، تیر و مرداد سال 0931 تهیه گردید و تصحیحات رادیومتریک و هندسی بر روی آن انجام شد. برای انجام پیاده‌سازی‌های الگوریتم SEBAL، از داده‌های ایستگاه هواشناسی کرج استفاده شد. همچنین مقدار تبخیر اندازه‌گیری شده از روش تشت تبخیر توسط شرکت آب منطقه‌ای استان تهران در نزدیکی دریاچه سد امیرکبیر به عنوان داده‌های واقعیت زمینی استفاده گردید. RMSE نتایج به دست آمده از SEBAL برای سد امیرکبیر با داده‌های زمینی، 72/0 میلیمتر بود که مقدار قابل قبولی محسوب می‌شد‌. مقدار تبخیر روزانه نیز از کل سطح دریاچه در تاریخ‌های منتخب به ترتیب 730/8، 346/01 و 534/5 متر در روز به دست آمد. علاوه بر این، نتایج نشان دهنده افزایش تبخیر از سطح مخزن سد در مناطق کم‌عمق به سمت مناطق عمیق‌تر بود که این مورد می‌تواند نشان دهنده کارایی نامناسب روش‌های نقطه‌ای اندازه‌گیری تبخیر باشد. در مجموع، نتایج بیانگر کارایی الگوریتم SEBAL برای برآورد تبخیر از سطح دریاچه‌های سدها بود و می‌توان با توجه به شرایط مکانی و زمانی هر منطقه، از آن برای تعیین تبخیر پهنه‌های آبی شیرین استفاده نمود.
 

کلیدواژه‌ها

• الگوریتم SEBAL
• تبخیر-تعرق
• تصاویرماهواره ای
• دریاچه سد
• پهنه بندی

20.1001.1.25883860.1397.27.106.4.8

عنوان مقاله [English]

Mapping dam lake evaporation using SEBAL evapotranspiration model Case study: Amir Kabir Dam

نویسندگان [English]

• Saeideh Zamani ¹
• Majid Rahimzadegan ²

¹ Water Resources Department, Civil Engineering Faculty, K. N. Toosi University of Technology

² Assistant Professor in water resources department, Faculty of civil engineering, K. N. Toosi University of Technology, Tehran, Iran

چکیده [English]

Extended Abstract
Introduction
Evaporation from the lakes behind the dams and freshwater lakes is one of the most important parameters in water resource losses. Therefore, zoning evaporation is very important in water resources management. There are various methods for measuring and estimating evapotranspiration (ET) that are used according to their accuracy and cost. These models include using evaporation pan and using meteorological models such as Bowen ratio and eddy correlation methods. Nowadays, modern methods such as utilizing satellite remote sensing images are developed to estimate evapotranspiration in different regions. Surface Energy Balance Algorithm for Land (SEBAL) is one of these algorithms which is highly regarded. SEBAL estimates ET as a residual in energy flux in the surface of land. This is done by calculating the difference in the soil heat flux and the sensible heat flux from the net radiation.
 
Material and Methods
Initially, SEBAL was extensively used for mapping evapotranspiration in lands and vegetation cover such as crop field, but it was rarely used to estimate evaporation from water bodies, especially freshwater bodies. The aim of this study was to use SEBAL algorithm to map evaporation from freshwater of dam lakes. In this regard, three Landsat Thematic Mapper images (TM) acquired in May 29th, July 9th, and August 1st, 2011 were provided from Amir Kabir (Karaj) dam and the downstream agricultural lands. The selected area is located between two provinces of Tehran and Karaj. Amir Kabir dam supplies a part of drinking and agriculture water for these two provinces. To implement SEBAL method, radiometric and geometric corrections were performed and image bands were converted to radiance and reflectance values according to their wavelengths.
In order to prepare required parameters of SEBAL, meteorological data measured by Karaj meteorological station at the selected dates were provided. These data included elevation of meteorological station, daily solar radiation, dew point temperature, wind speed, and air temperature. Furthermore, the evaporation values recorded by Tehran Regional Water Authority located at the southwestern part of the dam using evaporation pan were used as ground truth data which measurements and were performed in related dates.
All of the implementations of this research were accomplished using the ENVI 5.1, Excel 2007, Ref ET, and MATLAB R2012a software. The instantaneous ET at the time of satellite overpass was calculated calculate using SEBAL method and in order to calculate the daily ET, the calculation of the reference ET was necessary. To compute reference ET in this research, Ref ET software developed in Idaho University was utilized. One of the required data in the Ref ET software is hourly solar radiation. Because of the lack of hourly solar radiation data in the selected meteorological stations, angstrom method was used. Then, the ratio of instantaneous ET to reference ET was used to calculate the 24 hour ET.
 
Results and Discussion
In each stage of SEBAL method, its components, such as Normalized Difference Vegetation Index (NDVI), and Land Surface Temperature (LST) were checked to prevent the undesired errors. After performing implementations, the results showed that the absolute difference values of evaporation acquired from SEBAL method and ground truth data were 0.2, 0.2, and 0.3, in selected days, respectively, which leads to the Root Mean Square Value (RMSE) of 0.27 mm that is an acceptable value. Moreover, the total evaporation values from the entire dam surface for selected days were 8.037, 10.634, and 5.435 meters per day, respectively, which were significant values. The acquired map of evaporation from dam lake surface illustrated that the value of evaporation was increasing from coastal areas to deep regions. This was proved in the same researches. The values changed from 0.5 mm in the shoreline to 3.5 mm in deep water.
One of the uncertainty sources of this research was the use of daily solar radiation due to the lack of meteorological data and computing hourly values by using Angstrom method. Another uncertainty source is utilizing empirical relations such as relation of estimating atmospheric transmissivity, and narrow band emissivity and broad band emissivity which is better to calibrate before use. Another shortage of SEBAL method which can lead to uncertainty is empirical process of selecting cold and hot pixels which are used to estimate air temperature and soil temperature, respectively.
 
Conclusion
Despite the mentioned shortages of SEBAL method, the results showed the applicability of SEBAL method to mapping and estimating evaporation from freshwater lakes and dam lakes as an accurate and inexpensive method. Furthermore, the evaporation from freshwater lake surface was calculated using SEBAL model which were significant values in selected days and proved the requirement for protective operations.

کلیدواژه‌ها [English]

• SEBAL algorithm
• Evapotranspiration
• Satellite images
• Lake Dam
• Mapping