Sanjaya, Purba and Manik, Tumiar Katarina and Rosadi, Bustomi (2016) COMPARISON OF DIFFERENT MODELS IN ESTIMATING STANDARD EVAPOTRANSPIRATION IN LAMPUNG PROVINCE, INDONESIA. USR INTERNATIONAL SEMINAR ON FOOD SECURITY, 1. pp. 41-55. ISSN ISBN : 978-602-0860-08-4
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Abstract
Evapotranspiration (ET) is the loss of water to the atmosphere by the combined processes of evaporation from soil surfaces and transpiration from plants.Since various factors affect ET, including weather parameters; numerousequations have been developed to quantify standard ET. The equations vary in data requirements from very simple, empirically based or simplified equations to complex, more physically based equations. This study used six methods in estimating standard evapotranspiration using data from September 2011‒Agustus 2012from Climate Station at Masgar (05o10’20” S, 105o10’ 49”E, 50 m.a.s.l.) Lampung, Indonesia. The six models are: Hargreaves-Samani 1985 (H/S), FAO 24 Radiation (24RD), FAO 24 Blaney-Criddle (24BC), FAO 24 Pan Evaporation (24PAN), Linacre (Lina), andMakkink (Makk). The results were analyzed using statistics methods in error indicators, which are: Root Mean Square Error(RMSE), Mean Absolute Error (MAE), and LogaritmicRoot Mean Square Error(LOG RMSE), while the closeness among the models was analyzed using Index Agreement (I.A.). Direct measurement had also been done with measuring the water content inside lysimeters.The study concluded that Makkink model is the suitable simple model that should be chosen in Lampung lowland area to calculate ETowhen climate data is limited, besides the recommended FAO 56 Penman Monteith. Keyword: Evapotranspiration, Standard Evapotranspiration, FAO 56 PM, Makkink Model
| Item Type: | Article |
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| Subjects: | S Agriculture > S Agriculture (General) |
| Divisions: | Fakultas Pertanian (FP) > Prodi Agroteknolgi |
| Depositing User: | TUMIAR K Manik |
| Date Deposited: | 12 Jun 2017 02:03 |
| Last Modified: | 12 Jun 2017 02:03 |
| URI: | http://repository.lppm.unila.ac.id/id/eprint/3476 |
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