本文關鍵詞： 入滲 土壤含水率 土柱 濕潤鋒 在線檢測 arduino　出處：《昆明理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：入滲是水分進入土壤的過程,入滲性能是表征土壤水分狀況的重要參數(shù)。土壤人滲研究對于調(diào)節(jié)農(nóng)田土壤水分狀況、確定節(jié)水灌溉技術參數(shù)、調(diào)控降雨徑流、保持水土、水資源規(guī)劃設計及評價管理等方面具有重要意義。針對傳統(tǒng)的土壤入滲性能測定方法在獲取相關參數(shù)過程中需要工作人員全程參與、試驗過程耗時長、試驗工作量大、獲取數(shù)據(jù)量少且精度不高等突出問題。因此,本研究發(fā)明了一種土柱入滲性能檢測裝置,研制了基于arduino的土柱入滲性能在線自動檢測裝置,通過理論分析和軟件數(shù)值模擬,確定了主要結構參數(shù),并對裝置的檢測精度進行試驗驗證,獲得的主要結論如下:(1)根據(jù)人工觀測土柱入滲試驗的要求,提出了采用土壤水分傳感器和壓力應變式傳感器來檢測土壤含水率和累積入滲量的方法,并提出了利用土壤含水率檢測值推斷濕潤鋒位置的方法。(2)研制的土柱入滲性能在線自動檢測裝置主要由傳感器位置調(diào)節(jié)裝置、土樣盛放裝置、供水裝置、檢測模塊、控制模塊和上位機顯示存儲模塊等部分組成。(3)本文通過3種類型的步進電機和行程開關實現(xiàn)了傳感器位置調(diào)節(jié)和土樣盛放裝置回到初始位置的自動控制。選用arduino mega 2560和arduino Uno單片機開發(fā)板作為裝置的檢測和控制核心板,從而有效避免了裝置控制、檢測電路的接口和電路的干擾。開發(fā)了基于裝置控制電路和檢測電路的底層驅動程序,并使用LabVIEW軟件開發(fā)了上位機顯示界面,實現(xiàn)了檢測數(shù)據(jù)的在線共享功能。(4)采用入滲水頭為10 mm,容重為1.15、1.20和1.25 g/cm3的紅壤土對該裝置的入滲性能進行了驗證。通過9組試驗和18個檢測位置的試驗結果表明,1)該裝置的運行可靠度達100%;2)與標準的烘干法相比,土壤水分傳感器檢測得到土壤含水率的最大相對誤差為-4.4%;3)與人工觀測的濕潤鋒位置相比,土壤水分檢測值推斷出的濕潤鋒位置的相對誤差為12.8%;4)裝置自動檢測得到的累積入滲量與人工觀測得到的進行對比,最大誤差為1.2 g。因此,檢測結果滿足國家標準和入滲試驗要求,該裝置可作為土柱入滲的自動檢測試驗平臺。
[Abstract]:Infiltration is the process of water entering into soil, and infiltration performance is an important parameter to characterize soil moisture. Water and soil conservation, water resources planning, design and evaluation and management are of great significance. Traditional methods for determining soil infiltration performance require the participation of staff in the process of obtaining relevant parameters. The test process takes a long time, the test work is large, the amount of data obtained is less and the precision is not high. Therefore, a soil column infiltration performance testing device is invented in this study. An on-line automatic testing device for soil column infiltration performance based on arduino is developed. The main structural parameters are determined by theoretical analysis and software numerical simulation, and the testing accuracy of the device is verified by experiments. The main conclusions are as follows: (1) according to the requirement of artificial observation soil column infiltration test, the method of using soil moisture sensor and pressure-strain sensor to detect soil moisture content and cumulative infiltration amount is put forward. The method of estimating the position of soil moisture front based on soil moisture content is put forward.) the on-line automatic measuring device for soil column infiltration performance is mainly composed of sensor position adjusting device, soil sample holding device and water supply device. Detection module. Control module and host computer display storage module, etc. In this paper, three types of stepping motor and stroke switch are used to realize the automatic control of the sensor position adjustment and the return of the soil sample holding device to the initial position. Arduino mega is selected. The development board of 2560 and arduino Uno single chip microcomputer is used as the core board of detection and control of the device. Thus, the device control, the interface of the detection circuit and the interference of the circuit are avoided effectively. The bottom driver program based on the device control circuit and the detection circuit is developed. The display interface of the upper computer is developed by using LabVIEW software. The on-line sharing function of the data is realized. The infiltration head is 10mm and the bulk density is 1.15. The infiltration performance of 1.20 and 1.25 g / cm ~ 3 red loam soil was verified. 1) the reliability of the device is up to 100; 2) compared with the standard drying method, the maximum relative error of soil moisture content detected by soil moisture sensor was -4.4; 3) the relative error of the position of wetting front inferred from the soil moisture detection value is 12.8b, compared with the position of the wetting front observed by manual observation. 4) the maximum error of the cumulative infiltration measured by the equipment is 1.2 g compared with that obtained by manual observation. Therefore, the test results meet the requirements of national standards and infiltration tests. The device can be used as an automatic test platform for soil column infiltration.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：S152.7;S237

【參考文獻】

相關期刊論文 前10條

1 常恩浩;李鵬;張鐵鋼;肖列;徐國策;趙賓華;張yN;;旱季雨季對黃土丘陵退耕區(qū)植被根系分布及水分利用的影響[J];農(nóng)業(yè)工程學報;2016年24期

2 董s，

本文編號：1479159