Estimating actual evapotranspiration using water budget and soil  water reduction methods

Chanasyk, D. S.; Mapfumo, E.; Chaikowsky, Crystal L.A.

doi:10.4141/s05-063

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…Various modelling approaches have been used for estimation of evapotranspiration at regional scales (Ray & Dadhwal, 2001;Consoli et al, 2006;Tasumi & Allen, 2007). There are direct and indirect methods for evapotranspiration estimation (Chanasyk et al, 2006). Indirect methods include those based on the concept of actual evapotranspiration versus potential evapotranspiration and utilize meteorological data (Sharma, 1985).…”

Section: Introductionmentioning

confidence: 99%

The temporal dynamics of readily available soil moisture for plants in the technosols of the Nikopol Manganese Ore Basin

et al. 2019

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The restoration of a stable and productive ecosystem after drastic disturbances to the natural environment due to mining and open-cast mining may be achieved by means of reclamation. Investigation of the hydrological budget of technosols is important task in developing adequate approaches to reclamation. Sod lithogenic soils on red-brown clay, on grey-green clay were chosen as the objects of the investigation. The simulation of moisture content in Nikopol Manganese Ore Basin technosols was performed using the Penman-Monteith approach and evaluated the role of the dependence of soils’ surface albedo on the humidity in the intensity of evapotranspiration. The research was conducted during 2013–2015 at the station for research on reclaimed land within the Nikopol Manganese Ore Basin (city Pokrov, Ukraine). The experimental area for the study of optimal modes of agricultural reclamation was created in 1968–1970. Precipitation in the investigated area was found to fall very unevenly in time. In 2013, the duration of the rainless period was 259 days, in 2014 – 264 days, in 2015 – 261 days. The maximum daily rainfall varies within 18–49 mm. There are significant interannual differences in the intensity of rainfall. The minimum total annual precipitation in 2014 was due to a decrease in atypical rainfall in late winter and early winter. The maximum annual rainfall in 2015 was caused by intense rainfall both in the spring and in mid-summer and late autumn. The average annual temperature was 11.1 ºC and the annual totals did not statistically significantly vary within the study period. The average wind speed and average atmospheric humidity are statistically significantly different from year to year. The technosols’ colour properties and surface albedo varied depending on the moisture content. There is a linear relationship between the moisture content in the soil and albedo of the soil surface. The evaluation of readily available water content was carried out based on the Penman-Monteith model taking into account meteorological data, the water-physical properties of the technosols and the dependence of soil surface albedo on soil humidity. The distribution of this index for different teсhnosols is characterized by a high level of similarity of shape due to the fact that the overall climate factors are crucial in shaping the dynamics of moisture. A complex mixture of normal distributions is the best model for representing the experimental data. The readily available water content distribution can best be represented as a mixture of two normal distributions. The relatively high moisture level is characterized for winter and spring periods. Water content in sod-lithogenic soils on red-brown clay over the period of research never reached the value of the permanent wilting point. In 2013, the period when the moisture content was less than the value of the permanent wilting point lasted 23 days, and in 2014 this period lasted 39 days. Thus, you can always expect the phenomenon of drought under typical climatic conditions for the technosols on grey-green clay. It was found that monitoring water supplies before the start of the growing season can provide valuable information necessary for the selection of crops for cultivation in the current year. The results indicate the urgency of measures to save the winter rainfall on the fields.

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Section: Introductionmentioning

confidence: 99%

The temporal dynamics of readily available soil moisture for plants in the technosols of the Nikopol Manganese Ore Basin

et al. 2019

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“…The genetic components of both surface and groundwater runoff were obtained from a hydrograph of daily water flows by using the Flow Regimes from International Experimental and Network Data algorithm (Magnuszewski, 1990;Tomaszewski, 2001). The amount of evapotranspiration (runoff deficit) was established by calculating the difference between the sides of a water balance equation, that is, a method which is well known in the literature (Soczyn ´ska, 1997;Byczkowski, 1999;Pociask-Karteczka, 2003;Chanasyk et al, 2006;Narasimhan, 2008;Lee et al, 2009;Scott, 2010). Retention was computed based on daily water stages in the studied lakes, which were converted to volume, as a difference between the beginning and end of the balance period.…”

Section: Methodsmentioning

confidence: 99%

Water balance of lake-catchment systems with transformed water distribution

Ferencz

Dawidek²

2014

Management of Environmental Quality: An International Journal

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Purpose – The purpose of this paper is to assess the scale of changes in the distribution of water and their influence on the components of the hydrological balance in two lake catchments situated in the Leczna-Wlodawa Lake District. Design/methodology/approach – In order to estimate the scale of man-made modification of water distribution an analysis of published cartographic materials was used. The maps cover time-scale of over 150 years. The analysis was completed by territorial research carried out during water years 2007-2009. The elements of water balance equation were calculated on the basis of daily water levels, discharge, precipitations and lake volumes. Evaporation was calculated as the difference of balance gains and losses (runoff deficit). Findings – The study has shown high permanent human pressure on lake-catchment systems under study, since the 50 of the nineteenth century. Naturally drainless lakes were connected to the system of surface runoff, which modified radically directions and pace of water circulation. The most pronounced hydrologic changes of the lake-catchment systems under study occurred in the 60 of the twentieth century. Human pressure on water conditions resulted in changes of water balance elements relation (increased surface inflow and outflow). Originality/value – In the ecosystems with zonal watersheds, even slight modification of water distribution may lead to radical changes in the structure of lake-catchment systems’ water balance. The paper is first in polish literature that documents major water divide translocation, as well as bifurcation in the drainage area of the highest cascade lake. Man-made modifications cause natural ecosystems degradation, especially in the areas built with peat-bogs.

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“…The water fluxes include both incoming ones such as rainfall and supplementary irrigation (SI) and outgoing fluxes such as surface runoff (RO) and deep percolation (DP). The deep percolation losses depend on soil hydraulic properties (Ben-Asher & Ayars, 1990;Pereira et al, 2009) and are the hardest component to determine and are often neglected in similar studies (Chanasyk et al, 2006;Singh et al, 2017). The ET estimation using this method is similar to the one of the lysimeter method.…”

Section: Introductionmentioning

confidence: 99%

Estimating Evapotranspiration of Maize under Different Management Practices in a Semiarid Tropical Area Using the Soil Water Balance Method

Nyabwisho¹,

Kahimba²

2022

GEP

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Smallholder farmers in semiarid areas face low and erratic rainfall and need field management practices that conserve water in the root zone. This work evaluated the effect of mulching and DD (deep tillage) practices as a way to conserve soil moisture and thus improve water availability and maize crop yield in this water-scarce environment. The field experiment was carried out in which the soil moisture content (SMC) was monitored and the other water balance components were measured to quantify the crop ET with the soil water balance (SWB) method. The components of the SWB (rainfall, supplemental irrigation, runoff, deep percolation and change of soil moisture content) were measured for three consecutive seasons of 2018-2019, i.e. two long rain seasons (Masika 2018 and 2019) and one short-rains season (Vuli 2018). The estimation of the deep percolation (DP) involved calculating water fluxes from hydraulic properties measured in the laboratory and from hydraulic gradients measured with tensiometers in the field plots. Treatments significantly affected ET (p < 0.05) during the Vuli 2018 season. The estimated ET was highest in FC plots, medium in DD, and FCM recorded the lowest ET value. The significant difference in ET was between FCM and other treatments. Relative to a control treatment (farmers' cultivation, FC), mulching (FCM) reduced evapotranspiration by 14% and 18% during more water-stressed seasons of Vuli 2018 and Masika 2019. The ET reduction among the treatments was in line with the reduction in soil evaporation, as reflected in the results (of the other article of the same work). The crop transpiration was observed higher, which was consistent with the higher canopy cover observations for the two

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Estimating actual evapotranspiration using water budget and soil water reduction methods

Cited by 6 publications

References 20 publications

The temporal dynamics of readily available soil moisture for plants in the technosols of the Nikopol Manganese Ore Basin

The temporal dynamics of readily available soil moisture for plants in the technosols of the Nikopol Manganese Ore Basin

Water balance of lake-catchment systems with transformed water distribution

Estimating Evapotranspiration of Maize under Different Management Practices in a Semiarid Tropical Area Using the Soil Water Balance Method

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