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Numerical Simulation of Soil Water Dynamics Under Stationary Sprinkler Irrigation With Mohid-Land

机译：莫希德固定式喷灌下土壤水分动力学的数值模拟

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Water distribution in sprinkler irrigation systems remains one of the most challenging problems in irrigation water management. Due to lack of water distribution uniformity, parts of a field may be over-irrigated while others may be under-irrigated, thus affecting root water and nutrient uptake and crop yield. The objective of this paper was to show the capabilities of the MOHID-Land model in simulating soil water dynamics and maize growth under a stationary sprinkler irrigation system with low water distribution uniformity (56%). A 3D simulation domain (28x26x1m) was defined to consider different water application rates at the soil surface and the variability of the soil hydraulic properties (two soil types). The model was able to take into account the effect of water distribution and soil variability on soil water content and fluxes, root water uptake reductions due to water stress, soil evaporation, leaf area index and total dry biomass. The resulting soil water balance revealed that irrigation inputs were lower (329mm) than those theoretically defined to fulfil crop water requirements when the variable-rate application of water was not considered (540mm). Consequently, the range of variation of soil water stress in the simulation domain was relatively large (between 1 and 64%). MOHID-Land has thus the potential of becoming an important tool for precision irrigation by focusing on site-specific irrigation and crop management rather than the current field unit approach. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：喷灌系统中的水分配仍然是灌溉水管理中最具挑战性的问题之一。由于缺乏水分配均匀性，一块田地可能灌溉过度，而其他部分灌溉不足，从而影响根水和养分吸收以及作物产量。本文的目的是展示MOHID-Land模型在水分配均匀度较低（56％）的固定喷灌系统下模拟土壤水分动态和玉米生长的能力。定义了一个3D模拟域（28x26x1m），以考虑在土壤表面的不同施水量和土壤水力学特性（两种土壤类型）的可变性。该模型能够考虑到水分分布和土壤变异性对土壤水分和通量，因水分胁迫导致的根系水分吸收减少，土壤蒸发，叶面积指数和总干生物量的影响。由此产生的土壤水平衡表明，当不考虑可变比例的水施用量（540毫米）时，灌溉投入量（329毫米）要比理论上为满足作物需水量而确定的投入要低。因此，在模拟域中土壤水分胁迫的变化范围相对较大（在1％到64％之间）。因此，MOHID-Land通过专注于特定地点的灌溉和作物管理，而不是当前的田间单位方法，有可能成为精确灌溉的重要工具。版权所有（c）2016 John Wiley＆Sons，Ltd.

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