main irrigation canal 中文意思是什麼

main irrigation canal 解釋
灌溉乾渠
  • main : adj 1 主要的，主，全，總。2 充分的，盡量的；全力的，有力的。n 1 體力，氣力；力〈僅用於 with might...
  • 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。
  • canal : n. 1. 運河；溝渠，水道。2. 【建築】溝；【解剖學】管，道。3. 【天文學】火星表面的運河狀細長溝紋。vt. （-l（l）-）, 在…開運河；在…開溝，疏導。
  1. For example, when the design flow of upward of the peace bridge of upward of the east - one main canal is 45m3 / s, the actual flow quantity is 23. 8m3 / s on the 30th of september in 1989, the water level of the transition region terminal of the mouth of hao wan flume of the east - one main canal had gained the design level of 4. 3m, and the level between downstream and shang tian yuan tunnel was generally higher. it says that the actual discharge capacity now is only about 24m3 / s which is half of the design value. this not only make the benefit of the irrigation district abnormal, but also greatly hinder the economic development of the irrigation district, and lead to the canal run frequently at small flow, high water level, lengthen the discharge duration

    如東一乾渠上段太平橋以上設計流量45m ~ 3 s ， 1989年9月30日實測通水流量23 . 8m ~ 3 s時，東一乾渠郝灣渡槽出口漸變段末端水位已達到設計水位4 . 3m ，其下游至上天院隧洞水位也普遍偏高，即東一乾渠上段目前僅能通過流量24m ~ 3 s左右，只有設計值的50左右，不僅使灌區效益得不到正常發揮，嚴重阻礙了灌區范圍內的經濟發展，而且使渠道經常處于小流量、高水位運行，延長了次通水時間，大大增加了渠道工程的安全管理難度。
  2. Which is situated in the western of he nan and is drought year in year out and it is a multiple - purpose water supply development with agricultural irrigation, municipal water supply and rural water of men and domestic animals. the irrigation district was designed by he nan water survey designing institute in 1967, and began to be built in 1970. the aggregate main canal and the east - two main canal were built up and began to irrigate partially in 1974. up of the dong song part of the main canal had been built in 1980, and the first periodical project was completed in 1991. one part of the west main canal was built afterward

    河南省陸渾灌區是河南省百萬畝以上大型灌區之一，地處十年九旱的河南省西部，是一集農業灌溉，城市供水，農村人蓄吃水為一體的多目標供水工程，灌區於1967年由河南省水利勘測設計院開始勘測規劃設計， 1970年開工建設， 1974年建成總乾渠、東二乾渠，並通水局部施灌， 1980年完成東一乾渠東宋以上渠段， 1991年第一期工程竣工驗收，以後又修建了西乾渠部分工程。
  3. During 1970s - 1980s, irrigation management department launched canal lining for main canal. irrigation management department initiated large scale canal lining project because of great government finacial investment on water saving project resconstruction since 1995

    自七十至八十年代，開始對乾渠進行防滲襯砌，進入九十年代特別是1995年以後，國家加大了節水改造的投入，灌區開始了較大規模的渠道襯砌工程。
  4. Water delivery has been run over 30 years. the main canal has the problem that the actual conveying capacity is very low now and the conveying capacity of the east - one main canal i only half of the design value, this lead to guaranteed real - time efficiency of the irrigation of the farmland recede greatly. the downstream has no water and crops were drought to death have been seen more times in the irrigation period, this lead to the contradictory between the upstream and downstream on water usage, moreover, the lower discharge capacity of the dry canal in irrigation period is the main cause of the actual irrigated area is only half of the design value

    經過三十年的輸水運行，目前乾渠工程存在嚴重的輸水能力低問題，其中東一乾渠輸水能力只能達到原設計的1 2 ，使農田的適時灌溉保證率大大降低，多次發生灌溉期下游見不到水而旱死莊稼的情況，造成上下游用水矛盾突出，而且灌溉期乾渠過流能力偏小，是導致實際灌溉面積僅為設計值的1 3的重要原因。
  5. Hydraulic structures, velometers, weirs, and flumes are used to gauge water in many irrigation districts. the fundamental principles and suitable conditions of these water metering methods are introduced in this paper. the main problems in the development of water metering instruments and facilities as well as main causes of difficulty in popularization of the methods in irrigation districts are analysed. it is suggested that selection and construction of water metering facilities should be combined with canal lining in irrigation districts. it is also pointed out that for realization of automation of water metering it is necessary to develop and popularize portable and stationary water metering instruments step by step based on economic development levels in irrigation districts

    介紹利用水工建築物、流速儀、堰、槽進行量水的基本原理及各自適用條件.從量水儀器、設施的性能、價格及灌區經濟發展水平等方面，分析目前在灌區量水儀器、設施的開發研製方面存在的主要問題，以及灌區量水難以普及的主要原因.提出應結合灌區渠道防滲工程建設，合理選擇和建設量水設施，並根據灌區經濟發展水平，分步驟研製和推廣便攜式或固定式量水儀器，最終實現灌區量水自動化的灌區量水實施方案
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