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負(fù)水頭條件下水質(zhì)對(duì)濕潤(rùn)體運(yùn)移及水鹽分布的影響
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山西省科技攻關(guān)資助項(xiàng)目(20120311019—6);山西省高??萍奸_(kāi)發(fā)資助項(xiàng)目(2010104)


Effect of Water Quality on Wetting Front Moving and Salt-water Distribution under Negative Hydraulic Head
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    摘要:

    通過(guò)室內(nèi)試驗(yàn),分析了負(fù)水頭供水條件下,灌溉水鈉吸附比和鹽分濃度對(duì)濕潤(rùn)體運(yùn)移及水鹽分布的影響。結(jié)果表明,濕潤(rùn)體的最大水平濕潤(rùn)距離、最大垂直濕潤(rùn)距離以及累積入滲量均與時(shí)間呈冪指數(shù)關(guān)系,并隨著灌溉水鹽分濃度的增加和鈉吸附比的減小而增加;濕潤(rùn)體內(nèi)土壤含水率和電導(dǎo)率的分布近似為一組同心橢球面,并與濕潤(rùn)體半橢圓在水平方向的半軸平方呈線性關(guān)系,隨著半軸的增加,土壤含水率減小,而電導(dǎo)率增加;灌溉水鹽分濃度一定的條件下,隨著鈉吸附比的增加,濕潤(rùn)體內(nèi)的平均含水率減小,平均電導(dǎo)率增加,在鈉吸附比一定的條件下,灌溉水鹽分濃度對(duì)兩者的影響較小。

    Abstract:

    Effect of the sodium adsorption ratio (SAR) and salt concentration of irrigated water on soil water infiltration and salt-water distribution in wetted soil volume under negative hydraulic head were analyzed by laboratory experiments. Results indicated that the relationships between each next parameter and time, maximal horizontal wetted distance (X), maximal vertical wetted distance (Z), and accumulated infiltration (I) were a power function. X, Z and I increased with the increasing of salt concentration and decreasing of SAR. The distribution of water content and electric conductivity in wetted soil volume could be described as a series of concentric ellipsoid, and had the linear relationship with the square of semi-axis of ellipse (A2). With the increasing of A,water content decreased and electric conductivity increased in wetted soil volume. With the increasing of SAR, average soil water content decreased and average electric conductivity increased under certain salt concentration. Salt concentration had no significant impact on average soil water content and average electric conductivity under certain SAR.

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肖娟,江培福,郭秀峰,邱照寧,范肖予.負(fù)水頭條件下水質(zhì)對(duì)濕潤(rùn)體運(yùn)移及水鹽分布的影響[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2013,44(5):101-107. Xiao Juan, Jiang Peifu, Guo Xiufeng, Qiu Zhaoning, Fan Xiaoyu. Effect of Water Quality on Wetting Front Moving and Salt-water Distribution under Negative Hydraulic Head[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(5):101-107.

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  • 在線發(fā)布日期: 2013-04-28
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