Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | A Plot-scale uncertainty analysis of saturated hydraulic conductivity of a clay soil |
| Abstract | Simulating soil hydrological processes at the plot or field scale requires using spatially representative values of the saturated soil hydraulic conductivity, Ks. Sampling campaigns should yield a reliable mean of Ks with a sustainable workload since measuring Ks at many points is challenging. Uncertainty analysis can be used to determine the lowest number of measurements that yield a mean Ks value with a specified accuracy level. Potential and limitations of this analysis were tested in this investigation for different extents of the sampled rea and sampling densities. A clay soil was sampled intensively on two plots (plot area = 44 m2), two dates and using both small (0.15 m in diameter) and large (0.30 m) rings. With the small rings, intensively sampling an appropriate portion of the total plot area should be enough to establish the number of measurements yielding a certain accuracy level for the entire plot since this level remained nearly constant when the same number of measurements was performed on larger areas. Moreover, for these areas, the spatial resolution of the measurements did not influence appreciably the width of the confidence interval of the mean Ks value. However, working with larger rings was recommended since, in this case, the sampled area did not affect at all normalized confidence levels that, in addition, varied only a little with the number of the considered measurements of Ks. In practice, characterizing the plots required about 20 and 10 measurements with the smaller and the larger rings, respectively. The uncertainty analysis appears promising to plan practically sustainable soil sampling campaigns. |
| Source | Journal of hydrology (Amst.) |
| Keywords | saturated soil hydraulic conductivity; fine-textured soils; simplified falling head technique; bootstrap method. |
| Journal | Journal of hydrology (Amst.) |
| Editor | Elsevier, Oxford ;, Paesi Bassi |
| Year | 2020 |
| Type | Articolo in rivista |
| Authors | Vincenzo Bagarello; Emanuele Barca; Mirko Castellini; Massimo Iovino; Renato Morbidelli; Carla Saltalippi; Alessia Flammini |
| Text | 434648 2020 saturated soil hydraulic conductivity; fine textured soils; simplified falling head technique; bootstrap method. A Plot scale uncertainty analysis of saturated hydraulic conductivity of a clay soil Vincenzo Bagarello; Emanuele Barca; Mirko Castellini; Massimo Iovino; Renato Morbidelli; Carla Saltalippi; Alessia Flammini Department of Agricultural, Food and Forest Sciences, University of Palermo, Italy Water Research Institute IRSA , National Research Council CNR , Bari, Italy Council for Agricultural Research and Economics Research Center for Agriculture and Environment CREA AA , Bari, Italy Department of Civil and Environmental Engineering, University of Perugia, Italy Simulating soil hydrological processes at the plot or field scale requires using spatially representative values of the saturated soil hydraulic conductivity, Ks. Sampling campaigns should yield a reliable mean of Ks with a sustainable workload since measuring Ks at many points is challenging. Uncertainty analysis can be used to determine the lowest number of measurements that yield a mean Ks value with a specified accuracy level. Potential and limitations of this analysis were tested in this investigation for different extents of the sampled rea and sampling densities. A clay soil was sampled intensively on two plots plot area = 44 m2 , two dates and using both small 0.15 m in diameter and large 0.30 m rings. With the small rings, intensively sampling an appropriate portion of the total plot area should be enough to establish the number of measurements yielding a certain accuracy level for the entire plot since this level remained nearly constant when the same number of measurements was performed on larger areas. Moreover, for these areas, the spatial resolution of the measurements did not influence appreciably the width of the confidence interval of the mean Ks value. However, working with larger rings was recommended since, in this case, the sampled area did not affect at all normalized confidence levels that, in addition, varied only a little with the number of the considered measurements of Ks. In practice, characterizing the plots required about 20 and 10 measurements with the smaller and the larger rings, respectively. The uncertainty analysis appears promising to plan practically sustainable soil sampling campaigns. Published version Articolo in rivista Elsevier 0022 1694 Journal of hydrology Amst. Journal of hydrology Amst. J. hydrol. Amst. Journal of hydrology. Amst. Journal of hydrology Lausanne Amst. Journal of hydrology New York Amst. Journal of hydrology Oxford Amst. Journal of hydrology Shannon Amst. Journal of hydrology Tokyo Amst. emanuele.barca BARCA EMANUELE |