Modeling future irrigation water demands in the context of climate change: a case study of Jayakwadi command area, India

Sunil, Akshay; Deepthi, B.; Mirajkar, A. B.; Adarsh, S.

doi:10.1007/s40808-020-00955-y

Cited by 26 publications

(14 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 5 shows the historical and projected average reference crop evapotranspiration (ETo) [6], a reasonable approximation of atmospheric evaporative demand for each period (fixed potato cycle length used as an example). Increasing trends in ETo are generally consistent in the literature [7][8][9]14], although the magnitude can vary. This variation can be a result of competing effects of temperature increases and solar radiation decreases; however, existing literature does not typically summarize changes to solar radiation.…”

Section: Changes In Atmospheric Evaporative Demand (Eto)supporting

confidence: 82%

“…wind speed, and humidity; therefore, the effect of increased air tem decreased solar radiation may, to a certain extent counterbalance ETo estim Figure 5 shows the historical and projected average ref evapotranspiration (ETo) [6], a reasonable approximation of atmospheric demand for each period (fixed potato cycle length used as an example). Incr in ETo are generally consistent in the literature [7][8][9]14], although the magnit This variation can be a result of competing effects of temperature increa radiation decreases; however, existing literature does not typically summari solar radiation. As shown in Figure 4, future climate projections in the study an increase in temperature (increases ETo) and a decrease in solar radiation and the net result of this compensatory effect is a net increase in ETo for our 5), ranging from 3.5% to 15.8% compared to the historical period.…”

Section: Changes In Atmospheric Evaporative Demand (Eto)supporting

confidence: 60%

“…Tao et al [8] reported ETo increases of 9.8%, 12.6%, and 15.6% under Representative Concentration Pathway (RCP) 4.5, and 10.2%, 19.1%, and 27.3% under RCP8.5 for the periods 2011-2040, 2041-2070, and 2071-2100, respectively, compared to 1961-1990 reference period. A study in the Upper Godavari basin in India projected average ETo increases of ~3% by the end of the century, and NIR decreases of 14.7% due to large increases in annual precipitation [9]. Despite limitations, as will be argued in this article, several recent studies continue to assess changes in crop irrigation requirements based on ETo, e.g., [10][11][12][13], always projecting modest to substantial increases.…”

Section: Introductionmentioning

confidence: 99%

“…There is considerable spread in GCM climate projections, which can significantly bias conclusions depending on GCM choices. Most studies range from using just one GCM [9] to a handful [16]. In some cases, the GCM choices are based on capturing the extreme changes in the temperature and precipitation space [18], and in others, it is arbitrary with no explanation provided.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evapotranspiration of Irrigated Crops under Warming and Elevated Atmospheric CO2: What Is the Direction of Change?

et al. 2022

View full text Add to dashboard Cite

Future changes in crop evapotranspiration (ETc) are of interest to water management stakeholders. However, long-term projections are complex and merit further investigation due to uncertainties in climate data, differential responses of crops to climate and elevated atmospheric CO2, and adaptive agricultural management. We conducted factor-control simulation experiments using the process-based CropSyst model and investigated the contribution of each of these factors. Five major irrigated crops in the Columbia Basin Project area of the USA Pacific Northwest were selected as a case study and fifteen general circulation models (GCM) under two representative concentration pathways (RCP) were used as the climate forcing. Results indicated a wide range in ETc change, depending on the time frame, crop type, planting dates, and CO2 assumptions. Under the 2090s RCP8.5 scenario, ETc changes were crop-specific: +14.3% (alfalfa), +8.1% (potato), −5.1% (dry bean), −8.1% (corn), and −12.5% (spring wheat). Future elevated CO2 concentrations decreased ETc for all crops while earlier planting increased ETc for all crops except spring wheat. Changes in reference ET (ETo) only partially explains changes in ETc because crop responses are an important modulating factor; therefore, caution must be exercised in interpreting ETo changes as a proxy for ETc changes.

show abstract

Section: Changes In Atmospheric Evaporative Demand (Eto)supporting

confidence: 82%

Section: Changes In Atmospheric Evaporative Demand (Eto)supporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evapotranspiration of Irrigated Crops under Warming and Elevated Atmospheric CO2: What Is the Direction of Change?

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In addition, the relationship among ET c , P e , and I r is also affected by P distribution pattern, crop species, and planting area [11]. In the Jayakwadi command area, India, the ET c of major crops and P e increased during the growth period, resulting in less I r under climate change [29]. In the Najafabad plain in Iran, ET c increased and P e decreased during the growth period of major crops; therefore, more water needed to be irrigated [30].…”

Section: Introductionmentioning

confidence: 99%

Responses of Soybean Water Supply and Requirement to Future Climate Conditions in Heilongjiang Province

Nie²,

Tang³

et al. 2022

Agriculture

View full text Add to dashboard Cite

Understanding future changes in water supply and requirement under climate change is of great significance for long-term water resource management and agricultural planning. In this study, daily minimum temperature (Tmin), maximum temperature (Tmax), solar radiation (Rad), and precipitation for 26 meteorological stations under RCP4.5 and RCP8.5 of MIRCO5 for the future period 2021–2080 were downscaled by the LARS-WG model, daily average relative humidity (RH) was estimated using the method recommended by FAO-56, and reference crop evapotranspiration (ET0), crop water requirement (ETc), irrigation water requirement (Ir), effective precipitation (Pe), and coupling degree of ETc and Pe (CD) for soybean during the growth period were calculated by the CROPWAT model in Heilongjiang Province, China. The spatial and temporal distribution of these variables and meteorological factors were analyzed, and the response of soybean water supply and requirement to climate change was explored. The result showed that the average Tmin, Tmax, and Rad under RCP4.5 and RCP8.5 increased by 0.2656 and 0.5368 °C, 0.3509 and 0.5897 °C, and 0.0830 and 0.0465 MJ/m², respectively, while the average RH decreased by 0.0920% and 0.0870% per decade from 2021 to 2080. The annual average ET0, ETc, Pe, and Ir under RCP4.5 for 2021–2080 were 542.89, 414.35, 354.10, and 102.44 mm, respectively, and they increased by 1.92%, 1.64%, 2.33%, and −2.12% under the RCP8.5, respectively. The ranges of CD under RCP4.5 and RCP8.5 were 0.66–0.95 and 0.66–0.96, respectively, with an average value of 0.84 for 2021–2080. Spatially, the CD showed a general trend of increasing first and then decreasing from west to east. In addition, ET0, ETc, and Pe increased by 9.55, 7.16, and 8.77 mm per decade, respectively, under RCP8.5, while Ir decreased by 0.65 mm per decade. Under RCP4.5 and RCP8.5, ETc, Pe, and Ir showed an overall increasing trend from 2021 to 2080. This study provides a basis for water resources management policy in Heilongjiang Province, China.

show abstract

Prediction of Future Rainfall in the Upper Godavari Basin Using Statistical Downscaling Model

Deepthi¹,

Mirajkar²

2022

Disaster Resilience and Green Growth

View full text Add to dashboard Cite

Modeling future irrigation water demands in the context of climate change: a case study of Jayakwadi command area, India

Cited by 26 publications

References 37 publications

Evapotranspiration of Irrigated Crops under Warming and Elevated Atmospheric CO2: What Is the Direction of Change?

Evapotranspiration of Irrigated Crops under Warming and Elevated Atmospheric CO2: What Is the Direction of Change?

Responses of Soybean Water Supply and Requirement to Future Climate Conditions in Heilongjiang Province

Prediction of Future Rainfall in the Upper Godavari Basin Using Statistical Downscaling Model

Contact Info

Product

Resources

About