caa a22 4500 445837918 CHVBK 20180317145335.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00271-010-0244-2 doi (NATIONALLICENCE)springer-10.1007/s00271-010-0244-2 Impacts of spatial variability of basins microtopography on irrigation performance [Elektronische Daten] [M. Bai, D. Xu, Y. Li, L. Pereira] Land microtopography unevenness is a key variable affecting basin irrigation performances. Using stochastic modeling, a number of sets of spatially variable surface elevations were generated, and a two-dimensional basin irrigation model was used to simulate irrigation for the generated sets. Strip, narrow and wide basins, as well as graded and zero-levelled basins were analyzed. Results show that spatial variability of basin microtopography influences the infiltrated depth when the advance is completed (Z adv) and the irrigation uniformity (DUlq). When the degree of unevenness increases, the Z adv value and its range of variation also increase, thus indicating that overirrigation increases with unevenness, mainly when zero leveling is adopted, inflow rates are small, and basin length is larger. Differently, DUlq is relatively small and insensitive to unevenness in case of graded basins, but is much larger and sensitive in case of zero leveling. This indicates that when water saving is aimed, it is preferable to adopt graded basins and shorter cut-off times, while it is better to adopt zero leveling and high inflow rates when high DUlq is pretended. Springer-Verlag, 2010 Bai M. National Center of Efficient Irrigation Engineering and Technology Research, China Institute of Water Resources and Hydropower Research, 20 West Chegongzhuang Rd., 100044, Beijing, China aut Xu D. National Center of Efficient Irrigation Engineering and Technology Research, China Institute of Water Resources and Hydropower Research, 20 West Chegongzhuang Rd., 100044, Beijing, China aut Li Y. National Center of Efficient Irrigation Engineering and Technology Research, China Institute of Water Resources and Hydropower Research, 20 West Chegongzhuang Rd., 100044, Beijing, China aut Pereira L. CEER, Biosystems Engineering, Institute of Agronomy, Technical University of Lisbon, Tapada da Ajuda, 1349-017, Lisbon, Portugal aut Irrigation Science Springer-Verlag 29/5(2011-09-01), 359-368 0342-7188 29:5<359 2011 29 271 https://doi.org/10.1007/s00271-010-0244-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00271-010-0244-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bai M. National Center of Efficient Irrigation Engineering and Technology Research, China Institute of Water Resources and Hydropower Research, 20 West Chegongzhuang Rd., 100044, Beijing, China aut NATIONALLICENCE 700 1- Xu D. National Center of Efficient Irrigation Engineering and Technology Research, China Institute of Water Resources and Hydropower Research, 20 West Chegongzhuang Rd., 100044, Beijing, China aut NATIONALLICENCE 700 1- Li Y. National Center of Efficient Irrigation Engineering and Technology Research, China Institute of Water Resources and Hydropower Research, 20 West Chegongzhuang Rd., 100044, Beijing, China aut NATIONALLICENCE 700 1- Pereira L. CEER, Biosystems Engineering, Institute of Agronomy, Technical University of Lisbon, Tapada da Ajuda, 1349-017, Lisbon, Portugal aut NATIONALLICENCE 773 0- Irrigation Science Springer-Verlag 29/5(2011-09-01), 359-368 0342-7188 29:5<359 2011 29 271 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer