- Title
- Evaluation of variable-infiltration capacity model and MODIS-terra satellite-derived grid-scale evapotranspiration estimates in a river basin with tropical monsoon-type climatology
- Creator
- Srivastava, Ankur; Sahoo, Bhabagrahi; Raghuwanshi, Narendra Singh; Singh, Rajendra
- Relation
- Journal of Irrigation and Drainage Engineering Vol. 143, Issue 8, no. August 2017
- Publisher Link
- http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.0001199
- Publisher
- American Society of Civil Engineers
- Resource Type
- journal article
- Date
- 2017
- Description
- With the limited availability of meteorological variables in many remote areas, estimation of evapotranspiration (ET) at different spatiotemporal scales for efficient irrigation water management and hydrometeorological studies is becoming a challenging task. Hence, in this study, indirect ET estimation methods, such as moderate resolution imaging spectroradiometer (MODIS) satellite-based remote-sensing techniques and the water-budget approach built into the semidistributed variable infiltration capacity (VIC-3L) land-surface model are evaluated using the Penman-Monteith (PM) equation approach suggested in the literature together with a crop coefficient approach. To answer the research question of whether regional or local controls of a river basin with tropical monsoon-type climatology affect the accuracy of the VIC and MODIS-based ET estimates, these methodologies are applied in the Kangsabati River Basin in eastern India at 25 x 25 km resolutions attributed with dominant paddy land uses. The results reveal that the VIC-estimated ET values are reasonably matched with the PM-based ET estimates with the Nash-Sutcliffe efficiency (NSE) of 54.14-71.94%; however, the corresponding MODIS-ET values are highly underestimated with a periodic shift that may be attributed to the cloud cover and leaf shadowing effects. To enhance the field applicability of the satellite-based MODIS-ET products, these estimates are standardized by using a genetic-algorithm-based transformation that improves the NSE from -390.83 to 99.57%. Hence, this study reveals that there is the need of a regional-scale standardization of the MODIS-ET products using the PM or lysimeter data or possible modification of the MOD16A2 algorithm built-into the MODIS for generalization. Conversely, the satisfactory grid-scale ET estimates by the VIC model show that this model could be reliably used for the world's river basins; however, at smaller temporal scales, the estimates could be slightly inconsistent.
- Subject
- crop coefficient; evapotranspiration; food and agriculture organization (FAO)-56 Penman-Monteith (PM); genetic algorithm; moderate resolution imaging spectroradiometer (MODIS); variable infiltration capacity (VIC-3L); SDG 6; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1352276
- Identifier
- uon:30844
- Identifier
- ISSN:0733-9437
- Language
- eng
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