drought frequency 中文意思是什麼

drought frequency 解釋
乾旱頻數
  • drought : n. 1. 旱災，乾旱。2. 〈比喻〉（長期的）缺乏。3. 〈古語〉乾渴；乾燥。
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  1. The whole thesis consists of three parts. firstly, we establish the meteorological disaster database of jilin province and deduce the statistic frequency of the main meteorological disaster on the base of choosed meteorological disaster index. the spatial distribution law and time variation of drought, flood and low temperature cold damage are concluded with the gis technology

    全文主要由三部分組成：首先，在選擇氣象災害指標的基礎上，建立了吉林省氣象災害數據庫，統計主要農業氣象災害的發生頻率，然後利用gis技術得到吉林省旱澇、低溫冷害的空間分佈規律和時間變化。
  2. And the 30 - 60 day low - frequency character is more distinct in flood years than in drought years ; ( 2 ) the relationship of low - frequency olr and zonal wind is greatly different in drought years and flood years

    重點研究的旱、澇各4個年份的分析結果表明，澇年olr場的30 60天振蕩比旱年更為顯著。
  3. Abstract : in this paper, the major problems in water resources, flood and drought, and water environment in china are analysed, and new subjects of study on hydrology are pointed out, including the uncertainty of hydrological phenomena, the effect of human activities on hydrology, the calculation of water level frequency, the optimum effcet of water resource development and utilization, the analysis of water supply and demand, the mechanism of water - saving agricultural irrigation, flood and drought prevention, etc

    文摘:從水資源開發利用與保護、水旱災害防治等方面論述中國當前存在的主要水問題：水危機和水浪費同時存在、水污染日趨嚴重、防洪減災任重道遠、生態環境破壞嚴重、全球氣候變暖產生不利影響；進而論述水文學研究面臨的新課題：水文現象的不確定性、人類活動對水文的影響、水位頻率計算、水資源開發利用的最佳效應、水資源供需分析、農業節水灌溉機理及水旱災害的防治，並指出必須加強對這些新課題的研究
  4. Sparedescription : in this paper, the major problems in water resources, flood and drought, and water environment in china are analysed, and new subjects of study on hydrology are pointed out, including the uncertainty of hydrological phenomena, the effect of human activities on hydrology, the calculation of water level frequency, the optimum effcet of water resource development and utilization, the analysis of water supply and demand, the mechanism of water - saving agricultural irrigation, flood and drought prevention, etc

    描述:從水資源開發利用與保護、水旱災害防治等方面論述中國當前存在的主要水問題：水危機和水浪費同時存在、水污染日趨嚴重、防洪減災任重道遠、生態環境破壞嚴重、全球氣候變暖產生不利影響；進而論述水文學研究面臨的新課題：水文現象的不確定性、人類活動對水文的影響、水位頻率計算、水資源開發利用的最佳效應、水資源供需分析、農業節水灌溉機理及水旱災害的防治，並指出必須加強對這些新課題的研究
  5. The computed palmer drought index of 124 stations in the north of china are used to analyse some charactersin this region, including the main drouthy years and its severity, the drought range, etc. we also analyse the main drouthy periods, the frequency of each drought degree, the main area and the drought cycle in northwest china, north china and northeast china. on the base of the further modification of palmer drought severity model, a daily palmer drought severity model are developed. lt indicated that the daily drought index is accordant with the monthly drought index, and can reflect the change of severity in detail

    應用進一步修正的帕默爾旱度模式計算的我國北方地區124個站點的40年逐月旱度值，分析了我國北方地區的一些乾旱特徵，包括北方地區旱情較重的大旱年及其嚴重程度、主要乾旱區；華北、西北和東北地區各等級乾旱發生頻率、主要乾旱時段、乾旱周期等，為防旱抗旱提供了科學依據。
  6. Application of stochastic simulation technique to frequency analysis of regional drought

    隨機模擬方法在地區乾旱頻率分析中的應用
  7. The frequency of the flood and drought has distinct interannual change, floods emergence more and more from 1980, especially in north, there are more and more droughts in north region and no flood from 1980. in autumn, there are least precipitation in south - west region and most precipitation in south - east region, the precipitation difference between them is exceeding 95 % significance level, the difference between them is most prominent in september

    浙江秋季西南區降水最少，東南區最多，它們的差異已經超過0 . 05信度值，其中9月份降水的差別最明顯。另外，秋季3個區的平均降水量從9月到11月均表現為逐月減少的特徵。秋季旱澇頻率有明顯的年代際變化，秋季浙北區和東南區旱澇頻率都有減少的趨勢，而秋季西南區進入90年代后，乾旱的頻率明顯增加。
  8. The results indicated : the probability distribution of natural moisture deficiency rates of winter wheat during the growing period could be divided into three types because of their regional difference, which were mainly in the north part, the middle part and the south part respectively in producing area of northern china. in north and middle, the frequency of serious drought was higher, but in south, it was the light drought

    分析了不同乾旱年型和減產年型的時空分佈狀況及其相關關系，關系表明，乾旱年型和減產年型兩者沒有明顯的一致性，而且乾旱年型發生的站次多於對應的減產年型，尤其較重的乾旱年型出現較多，而較重的減產年型極少。
  9. But along with the population increase, economic development and natural condition change, the dry and water deficient situation becomes increasingly serious, the drought occurrence frequency, scope and impacting area expand successively, in the meanwhile, some structural and systematic obstacles existed in long - term drought fighting work have emerged and the drought fighting work faces unprecedented trial

    但是隨著我國人口增加，經濟發展和自然條件變化，我國乾旱缺水的形勢日益嚴峻，旱災發生的頻率、范圍和影響的領域不斷擴大，同時，長期抗旱工作中存在的一些體制、制度性障礙也顯露出來，抗旱工作面臨前所未有的考驗。
  10. The north karst mountain area of guangdong is one of the main impoverished region in guangdong, it ' s natural environment is congenitally fragile, the social and economic sustainable development is restricted by eco - environment problems such as water anti soil erosion, shortage in water resource, increased frequency in natural drought and waterlogging disasters, etc

    摘要粵北巖溶山區是廣東省主要的貧困地區之一，自然環境先天脆弱，水土流失嚴重、水資源短缺、早澇災害頻繁等一系列生態問題已成為制約當地社會經濟可持續發展的關鍵因素。
  11. The results showed the drought index could successively and dynamically monitor the drought process, so it was the better representative ; the frequency of spring drought of the loess plateau area in gansu was stronger in north than in south and its center is in gansu center ; the frequency of serious late spring drought was increasing while that of early spring drought was decreasing

    結果表明： （ 1 ）乾旱指數能夠連續動態地監測乾旱過程，因而具有較好的代表性； （ 2 ）甘肅黃土高原地區早春旱和晚春旱北部高於南部，乾旱中心在隴中； （ 3 ）重晚（早）春旱的發生頻率增加（減少） ，站數增多（減少） ； （ 4 ）區域性早春旱隨年代呈下降趨勢，區域性晚春旱略有上升的趨勢，但不明顯。
  12. Affected by the subtropical monsoon climate, jiangsu province is one of the provinces which have much natural disaster and drought, steady rain, waterlogging are its primary meteorological disasters. using citystar 3. 0, city star gis and reasonable indicators for disaster estimation, this paper progresses evaluation and analysis for its primary meteorological disasters such as drought, steady rain and waterlogging. in this work, the frequency of disaster and the risk to agriculture are taken into accounted

    因此，本文以該地區為例，選用影響該省主要氣象災害的定量指標，從災害出現頻率以及對農業生產帶來的風險出發，採用合理的災害風險評估指標，藉助于地理信息技術gis的空間分析方法，以風險指數為區劃指標，劃分風險等級，分季節對該省的主要氣象災害乾旱、連陰雨、雨澇的嚴重程度進行了評估和分析，獲得了gis系統支持下的災害風險區劃專題地圖。
  13. The precipitation decline from september to november. the frequency of autumn flood and drought have distinct interannual changes, the trend in north and south - west region is declining and in south - west is increasing from 1990

    文章還對全省范圍的年、春季、冬季的氣候變化進行了研究，結果表明，浙江省的年平均氣溫變化都是正趨勢，特別是浙江省北部增溫很明顯，這與北半球大范圍變暖的特徵是一致的。
  14. By using wavelet and bandpass filter methods, the different characters of low frequency oscillation ( lfo ) of olr and wind field for eight anomalous flood / drought years in middle and low reaches of yangtze rivers during may - august are investigated

    應用小波變換與帶通濾波等方法分析了80年代以來長江中下游地區夏季8個典型旱澇年份的olr場、風場的低頻特徵及旱澇年位勢高度場的差異。
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