irrigation net 中文意思是什麼

irrigation net 解釋
灌溉網
  • irrigation : n. 1. 灌溉；水利。2. 【醫學】沖洗（法），〈pl. 〉沖注洗劑。adj. -al ,-ist n. 灌溉者，水利專家。
  • net : n 因特網。 supply Net services 提供因特網服務。 n 1 網，網眼織物，（花邊的）織物。2 網狀物，網狀...
  1. The change of net radiation, earth temperature and relative humidity in the vegetable layer of cotton field was investigated on the basis of the data collected from microclimate in vegetable layer of cotton field with drip irrigation of the mulching film under increasing temperature effect in desert

    摘要根據沙漠增溫效應下膜下滴灌棉田植被層內小氣候觀測資料，分析研究了棉田植被層內的凈輻射、地溫和相對濕度的變化。
  2. At the same time, using the results of model, the paper provides the optimization irrigation quota and the aim of high yield and high benefit based on the principle that the net benefit of unit water is highestusing the model, we can reasonably distribute the irrigation water for spring - wheat during growing period on the condition of different irrigation quota. through evaluating the comparative yield by the model, the paper gains that the reduction of spring - wheat output is biggest when the irrigation quote is between 100 and 200. the thesis also gains that the corresponding economic irrigation quota is 170 - 120m3 / 667m2. above results can provide scientific reference for irrigation water optimization distribution for crops in the individual irrigation area and the programming of irrigation district

    在現有的生產條件下，可以利用模型在不同的灌溉定額下對春小麥生育期灌水進行合理的分配，並可以利用模型進行作物相對產量的評估，得出當灌溉定額在100 m 200范圍內時，春小麥的產量下降幅度較大，最後得出相應的經濟灌溉定額為170 120m ~ 3 667m ~ 2 ，為今後河套灌區各灌域多作物灌溉水量最優分配以及灌區的規劃設計方面提供了科學參考依據。
  3. The first part is about the computing of crop water requirements ( or crop evapotranspiration ) and net irrigation requirements ( nir ) of ten crops in bojili irrigated district. then the traditional irrigation schedules of winter wheat and summer maize, which are the main crops in bojili, were evaluated with simulating model isareg. third, the field application efficiency in the experimental areas was evaluated from three methods

    本文即是由灌區實測資料計算各種作物需水量，推求其凈灌溉需水量；然後通過模型檢驗現行作物灌溉制度是否具有合理性，並對田間灌溉系統進行評價，求其實際田間灌溉效率；最後由兩種不同灌溉制度方案的對比，確定試區合理的作物灌溉制度，在此基礎上求出各代表年的田間灌溉需水量和用水過程線。
  4. In the fourth part, the field irrigated water requirement were gotten based on the recommended irrigation schedules and irrigated areas often crops. in this paper, the reference evapotranspition et0 in three counties in bid was computed by penman - monteith method and the crop coefficients, kc of ten crops by kcisa model and the crop water requirements, etc, were computed simply by kc et0. meanwhile, four representative years by frequency analysis are gotten according to net irrigation requirements and planted areas of different crops in bojili irrigation district

    本文首先採用fao最新推薦的penman - monteith方法計算灌區的參照騰發量et _ 0 ，用kcisa按照fao的計算方法推求十種作物的作物系數k _ c ；由此基礎上計算出作物需水量et _ c ，根據結果分析了不同作物的需水規律；同時用作物缺水量nir （凈灌溉需水量）進行頻率計算，求出了灌區的四個代表年，並分析了代表年年內自然水分狀況和作物缺水規律。
  5. Based on the analyses of the investment of nozzle tube net and relationship between the annual operation cost and tube diameter function of a fixed spray irrigation system, a mathematic model to calculate the economical tube diameter of a spray irrigation system is developed by using the minimum expense norm and nonlinear planning theory in engineering economic analysis, and a direct calculation formula for the economical tube diameter in unrestrained conditions is presented

    摘要在分析了固定式噴灌系統的管網投資、年運行費用與管徑函數關系的基礎上，利用工程經濟分析中費用最小化準則和非線性規劃理論，建立了求解噴灌系統管網經濟管徑的數學模型，並給出了無約束條件直接求解經濟管徑的計算式。
  6. 2. builds up decision model for water resource ' s optimal distribution of large irrigation areas in this thesis. this model resolves the optimal decision problem of how to distribute water resource to meet maximal total net profit in irrigation basins, when water supply potential of irrigation areas " canal head and bailing capability of pumping station hold the line

    2 、建立了大型灌區水資源優化調度決策模型，研究在灌區渠首供水能力和泵站提水能力一定的條件下，將灌區水資源如何調配才使得灌區總凈收益達到最大值的優化決策問題。
  7. Based on mentioned above, as example, the topic 3 selects weidian irrigation area in the south and chengbei irrgation area in the north in huaibei plain, and the maths models have been established with maximal net benefit of annual irrigation as objective according to the method of linear planning of system engineering

    以位於淮北平原中南部韋店灌區和北部亳州城北灌區為實例，根據該區農業資源特點、水資源緊缺狀況，種植條件、灌排工程現狀，採用線性規劃方法，建立了兩個典型灌區水資源優化配置數學模型。
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