0.99),符合Philip入滲模型水平吸滲項(xiàng)入滲規(guī)律;微潤(rùn)管出流速率因多孔介質(zhì)管壁穿透入滲、管周土壤水分入滲分別隨時(shí)間呈現(xiàn)出初期驟增、線性減小的演變規(guī)律;改變上邊界條件后各處理蒸發(fā)均顯著增大,然而入滲速率只隨溫度增加而提高,吹風(fēng)帶走土表熱量,入滲速率反而減?。还庹掌陂g,L、LW處理入滲速率分別增長(zhǎng)56.56%、29.51%;撤去光照2h后,LW處理蒸發(fā)強(qiáng)度不變,入滲速率驟降5.90%,揭示了微潤(rùn)灌對(duì)溫度響應(yīng)的敏感性遠(yuǎn)高于上邊界蒸發(fā)。濕潤(rùn)鋒運(yùn)移距離與時(shí)間呈顯著冪函數(shù)關(guān)系,溫度提高后入滲速率增加促進(jìn)了濕潤(rùn)鋒運(yùn)移,溫差和重力勢(shì)共同驅(qū)動(dòng)下水分向背離熱源方向移動(dòng),光照處理中濕潤(rùn)鋒水平運(yùn)移距離Dhoriz、垂直向下運(yùn)移距離Ddown較預(yù)測(cè)值分別增長(zhǎng)75.81%、99.30%。該研究揭示了源于輻射的地溫變化在微潤(rùn)灌入滲中的關(guān)鍵驅(qū)動(dòng)效應(yīng),有效補(bǔ)充了微潤(rùn)灌在溫差、輻射驟變區(qū)域的管出流及土壤水分動(dòng)態(tài)運(yùn)移機(jī)理,研究結(jié)果可為基于氣象數(shù)據(jù)、作物需水和墑情的微潤(rùn)灌智慧調(diào)控模式設(shè)計(jì)提供理論依據(jù)。"/>

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變溫度-風(fēng)速模擬條件下微潤(rùn)灌工況自適應(yīng)調(diào)節(jié)機(jī)理
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國(guó)家自然科學(xué)基金項(xiàng)目(52109053、51879071)、江蘇省自然科學(xué)基金青年項(xiàng)目(BK20200523)、國(guó)家科技獎(jiǎng)后備培育項(xiàng)目(20212AEI91011)、江西省水利科學(xué)院開(kāi)放研究基金項(xiàng)目(2021SKTR03)、中國(guó)博士后基金面上項(xiàng)目(2021M690874)和國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2020YFD0900701)


Mechanism of Self-adaptive Moistube Irrigation at Different Simulative Temperatures and Wind Speed Factors
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    通過(guò)模擬光照、吹風(fēng)改變蒸發(fā)強(qiáng)度,對(duì)比分析了4種蒸發(fā)條件(CK、光照(L)、吹風(fēng)(W)、光照+吹風(fēng)(LW))下微潤(rùn)灌入滲速率以及濕潤(rùn)體變化特征。結(jié)果表明,常溫下微潤(rùn)灌累積入滲量與時(shí)間呈顯著線性相關(guān)關(guān)系(決定系數(shù)R2>0.99),符合Philip入滲模型水平吸滲項(xiàng)入滲規(guī)律;微潤(rùn)管出流速率因多孔介質(zhì)管壁穿透入滲、管周土壤水分入滲分別隨時(shí)間呈現(xiàn)出初期驟增、線性減小的演變規(guī)律;改變上邊界條件后各處理蒸發(fā)均顯著增大,然而入滲速率只隨溫度增加而提高,吹風(fēng)帶走土表熱量,入滲速率反而減?。还庹掌陂g,L、LW處理入滲速率分別增長(zhǎng)56.56%、29.51%;撤去光照2h后,LW處理蒸發(fā)強(qiáng)度不變,入滲速率驟降5.90%,揭示了微潤(rùn)灌對(duì)溫度響應(yīng)的敏感性遠(yuǎn)高于上邊界蒸發(fā)。濕潤(rùn)鋒運(yùn)移距離與時(shí)間呈顯著冪函數(shù)關(guān)系,溫度提高后入滲速率增加促進(jìn)了濕潤(rùn)鋒運(yùn)移,溫差和重力勢(shì)共同驅(qū)動(dòng)下水分向背離熱源方向移動(dòng),光照處理中濕潤(rùn)鋒水平運(yùn)移距離Dhoriz、垂直向下運(yùn)移距離Ddown較預(yù)測(cè)值分別增長(zhǎng)75.81%、99.30%。該研究揭示了源于輻射的地溫變化在微潤(rùn)灌入滲中的關(guān)鍵驅(qū)動(dòng)效應(yīng),有效補(bǔ)充了微潤(rùn)灌在溫差、輻射驟變區(qū)域的管出流及土壤水分動(dòng)態(tài)運(yùn)移機(jī)理,研究結(jié)果可為基于氣象數(shù)據(jù)、作物需水和墑情的微潤(rùn)灌智慧調(diào)控模式設(shè)計(jì)提供理論依據(jù)。

    Abstract:

    The evaporation intensity was changed by simulating light and blowing wind. Comparing the characteristics of moistube irrigation infiltration rate and wetting body changes under four different evaporation conditions (CK, Light (L), Wind (W), Light+Wind (LW)), it was found that the cumulative infiltration of moistube irrigation at room temperature was significantly linearly correlated with time (coefficient of determination R2>0.99), which was consistent with the infiltration law of the horizontal absorption term of the Philip infiltration model. The infiltration rate of moistube outflow showed an initial sudden increase and then linear decrease with time due to the penetration of infiltration through the wall of porous medium and infiltration of soil water around the tube respectively. The evaporation of each treatment was increased significantly after changing the upper boundary conditions. However, the infiltration rate was increased only with the increase of temperature as the infiltration rate even decreased when the wind carried away the heat from the soil surface. During the light period, the infiltration rates of L and LW treatments were increased by 56.56% and 29.51%, respectively. After the withdrawal of light for 2h, the evaporation intensity of LW treatment remained unchanged, and the infiltration rate plummeted by 5.90%, which revealed that the sensitivity of moistube irrigation to temperature response was much higher than that of evaporation at the upper boundary. The transport distance of wetting fronts showed a significant power function relationship with time and the increase of infiltration rate after the temperature increase promoted the transport of wetting fronts, which was driven by both temperature difference and gravitational potential in the direction of moving away from the heat source. Compared with the prediction, the horizontal migration distance Dhoriz and vertical downward migration distance Ddown in the light treatment were increased by 75.81% and 99.30%, respectively. The research result can provide theoretical basis for the design of smart regulation model of moistube irrigation based on meteorological data, crop water demand and moisture conditions.

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朱成立,李依,王策,庫(kù)熱西·吾爾開(kāi)西,段正宇.變溫度-風(fēng)速模擬條件下微潤(rùn)灌工況自適應(yīng)調(diào)節(jié)機(jī)理[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2023,54(3):347-355,362. ZHU Chengli, LI Yi, WANG Ce, KUREXI Wuerkaixi, DUAN Zhengyu. Mechanism of Self-adaptive Moistube Irrigation at Different Simulative Temperatures and Wind Speed Factors[J]. Transactions of the Chinese Society for Agricultural Machinery,2023,54(3):347-355,362.

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  • 收稿日期:2022-11-26
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  • 在線發(fā)布日期: 2023-03-10
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