Effect of irrigation in simulating long-term evapotranspiration climatology in a human-dominated river basin system

Jaksa, W. Thilini; Sridhar, Venkataramana

doi:10.1016/j.agrformet.2014.09.008

Cited by 39 publications

(21 citation statements)

References 37 publications

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“…These results suggest that higher differences in EQ had a great impact on drought conditions that were computed by SSI. Soil moisture is a crucial variable of the climatic system since it plays a critical role in land-atmosphere feedbacks including plant transpiration, bare soil evaporation, and energy fluxes at the regional to global scales (Sridhar and Wedin, 2009;Seneviratne et al, 2010;Jaksa and Sridhar, 2015). In addition, accurate quantification of soil moisture and a statistically based soil moisture index would be significantly beneficial to reduce uncertainties in future climate projections, particularly for extreme events such as droughts as well as their agricultural impacts.…”

Section: Time Series Of Drought Indicesmentioning

confidence: 99%

Assessment of Future Drought Conditions in the Chesapeake Bay Watershed

Kang

Sridhar

2017

J American Water Resour Assoc

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Impacts of climate change on the severity and intensity of future droughts can be evaluated based on precipitation and temperature projections, multiple hydrological models, simulated hydrometeorological variables, and various drought indices. The objective of this study was to assess climate change impacts on future drought conditions and water resources in the Chesapeake Bay (CB) watershed. In this study, the Soil and Water Assessment Tool (SWAT) and the Variable Infiltration Capacity model were used to simulate a Modified Palmer Drought Severity Index (MPDSI), a Standardized Soil Moisture index (SSI), a Multivariate Standardized Drought Index (MSDI), along with Coupled Model Intercomparison Project Phase 5 (CMIP5) climate models for both historical and future periods (f1: 2020-2049, f2: 2050-2079). The results of the SSI suggested that there was a general increase in agricultural droughts in the entire CB watershed because of increases in surface and groundwater flow and evapotranspiration. However, MPDSI and MSDI showed an overall decrease in projected drought occurrences due to the increases in precipitation in the future. The results of this study suggest that it is crucial to use multiple modeling approaches with specific drought indices that combine the effects of both precipitation and temperature changes.(KEY TERMS: drought projection; climate change; drought indices; hydrologic models.) Kang, Hyunwoo and Venkataramana Sridhar, 2018. Assessment of Future Drought Conditions in the Chesapeake Bay Watershed.

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Section: Time Series Of Drought Indicesmentioning

confidence: 99%

Assessment of Future Drought Conditions in the Chesapeake Bay Watershed

Kang

Sridhar

2017

J American Water Resour Assoc

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“…While irrigation contributes to food security for a large populated region like India, at the same time it influences the water and energy cycles (Haddeland, Lettenmaier, et al, ; Jaksa & Sridhar, ; Sridhar, ). Well‐parameterized land surface models can be used to study the effect of irrigation on water and energy budgets in an off‐line fashion or coupled with atmospheric models.…”

Section: Introductionmentioning

confidence: 99%

Strong Influence of Irrigation on Water Budget and Land Surface Temperature in Indian Subcontinental River Basins

et al. 2019

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Irrigation modulates the terrestrial water budget in intensively irrigated regions. However, the influence of irrigation on water budget and land surface temperature (LST) has not been quantified in Indian subcontinental river basins. Here, using the in situ and satellite‐based observations and the Variable Infiltration Capacity model with irrigation scheme, we show that the presence of irrigation substantially alters water budget (especially evapotranspiration, ET) and LST in the subcontinental river basins. While irrigation results in increased ET in all the 18 subcontinental basins, mean annual ET of Indus and Ganges basins increases by 47% and 12%, respectively, due to irrigation. Total runoff has increased in the most basins due to irrigation. Irrigation has a remarkable influence on LST with cooling of 0.2–0.65 °C. Compared to other basins, irrigation water demand is high in Indus and Ganges basins during the postmonsoon season (October–January). Our results show that between 1951 and 2012, irrigation demand has decreased in 13 out of the 18 basins during the premonsoon season (February–May). However, irrigation water demand increased in 12 out of the 18 basins in the postmonsoon season. Changes in irrigation demands are largely driven by changes in soil moisture due to weakening/strengthening of the summer monsoon precipitation. Our findings have implications for water budget estimation over intensively irrigated basins where ET might be substantially underestimated in the previous studies that do not consider the role of irrigation.

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“…The BEACH started calibrating for a 2001-2004 period for four types of crops (mentioned in Table 4) and the before-calibrated simulated E (averaged from rice and shrub E) was much lower compared to observed E ( Besides the climatic aspects such as humidity, wind, radiation and precipitation, the cropping irrigation, crop growing [30] and land use changes [4] have important effects on E and ET. For this case study, some differences between simulated and observed E might come from changes in crop and land use because we kept the cropping sowing dates and land use unchanged over the simulation period.…”

Section: Beach Calibration and Validation For Evaporationmentioning

confidence: 99%

“…Similarly with studies on surface runoff, there is a large amount of literature available on research into ET including direct or in situ measurement [25,26] and indirect methods (referring to modeling [3,16] and using satellite technology [27,28]), from watershed/catchment scales [29,30] to the global scale [31][32][33] and others. Surprisingly, despite many scientific works having been conducted on ET elsewhere in the world as mentioned above, few or even no previous studies on that topic were found for the case study in Yen Bai province or in North Vietnam.…”

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confidence: 99%

Modeling Surface Runoff and Evapotranspiration using SWAT and BEACH for a Tropical Watershed in North Vietnam, Compared to MODIS Products

Nguyễn

Kappas

2015

IJARSG

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Accurate estimation of surface runoff (Q) and evapotranspiration (ET) is a challenging task but an important research topic because both Q and ET play vital roles in the study of the hydrological cycle, of climate change, water resources, flood management and so on. In this paper we will present the modeling method to estimate the daily Q and ET for a medium-sized watershed in the tropical region of the North of Vietnam using the Soil and Water Assessment Tool (SWAT) and Bridging Event and Continuous Hydrological (BEACH) models. The models were calibrated and validated for the river discharge for SWAT and evaporation (E) for BEACH in a 12 year period from 2001 to 2012. The simulated ETs by the models were compared with the satellite-based ET of MODIS products. Our simulation results show that the SWAT and BEACH models are capable of satisfactorily reproducing (with the NSE > 0.62 and R 2 > 0.78) the stream-gauged river discharge and the observed E, respectively. Daily ET varied from 0.3 to 14 mm day -1 and was highest from May to August and lowest from December to March. Although the monthly and yearly MODIS ETs were slightly higher than those of SWAT and BEACH, a strong relationship between them was found with a standard deviation ranging from three to 40 mm. A light decrease of ET values in the 12 years can be seen in the result analyses; however a longer simulation time might be needed to ensure this trend.

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Effect of irrigation in simulating long-term evapotranspiration climatology in a human-dominated river basin system

Cited by 39 publications

References 37 publications

Assessment of Future Drought Conditions in the Chesapeake Bay Watershed

Assessment of Future Drought Conditions in the Chesapeake Bay Watershed

Strong Influence of Irrigation on Water Budget and Land Surface Temperature in Indian Subcontinental River Basins

Modeling Surface Runoff and Evapotranspiration using SWAT and BEACH for a Tropical Watershed in North Vietnam, Compared to MODIS Products

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