| 引用本文: | 毛程阳,缴锡云,宋国强,等.墒情监测站基座埋设对土壤水分分布的影响[J].灌溉排水学报,2017,36(3):. |
| MAO Chengyang,JIAO Xiyun,SONG Guoqiang,et al.墒情监测站基座埋设对土壤水分分布的影响[J].灌溉排水学报,2017,36(3):. |
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| 摘要: |
| 为确定传感器埋设的合理位置，借助Hydrus-2D软件，对长、宽、高均为50 cm，顶面埋设在地面以下50 cm的基座，结合中国科学院南皮生态农业试验站冬小麦抽穗期的情况，建立了土壤水分运动模型，分别模拟了在有无基座的条件下各时期的土壤体积含水率，并计算了不同条件下因埋设基座而产生的偏差。结果表明，离基座越近，影响越明显。基座的埋设使得其周边土壤雨后的含水率偏大，灌前的含水率偏小。雨后的偏差主要表现在70 cm深度以下的土层，灌前的偏差主要表现在80 cm深度以内的土层。因此，在水平方向与基座的距离不小于70 cm的剖面上埋设传感器，含水率偏差的绝对值均控制在0.02以内，基座对含水率测量的影响可以忽略。 |
| 关键词: 墒情监测；土壤含水率；基座；传感器；数值模拟 |
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| Effects of Base Layout of the Monitoring Station on Soil Water Distribution |
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MAO Chengyang , JIAO Xiyun, SONG Guoqiang , LIU Kaihua , GUO Weihua
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College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China; State Key Laboratory of Hydrology-water Resourced and Hydraulic Engineering, Hohai University, Nanjing 210098, China; Flood Control and Drought Relief Headquarters Office of Hebei Province, Shijiazhuang 050011, China
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| Abstract: |
| In order to determine the suitable position for sensors, the concrete base, which was all 50 cm in length, width and height, was buried 50 cm below ground, and the modeling of the movement of soil water during the heading period of winter wheat in ecological test station of Nanpi in Hebei province was set up by Hydrus-2D. The volumetric water contents before and after inbuilt concrete base were calculated by Hydrus-2D, and the deviations caused by the concrete base under different conditions were also analyzed. The result showed that soil water content around the base was increased after the rain and reduced before irrigation. The deviation was notable at the depth of more than 70 cm after the rain and less than 80 cm before irrigation. The influence decreased with the increasing distance between monitoring points and the concrete base. The absolute value of water content deviations were less than 0.02 and the influence could be ignored at the profile 70 cm away from the concrete base. |
| Key words: soil moisture monitoring; soil water content; concrete base; sensors; numerical simulation |
