frequent flood 中文意思是什麼
frequent flood
解釋
普通洪水-
However, for a long time agricultural natural resources have been unreasonably used and excessively exploited so that pylr has frequent disasters of flood and aridness and people there have a poor life
但是長期以來由於農業自然資源的不合理利用和過度開發，致使該區域生態惡化，災害頻繁，人民生活困苦。 -
The paper analyzes and summarizes the following laws of distinctive sediment yield produced in storm floods of the region based on predecessors ' study : storm is the main dynamic force of erosive sediment yield and storm, flood and sediment exist an inevitable relation ; the flood occurring time is concentrated with high peaks and huge volume, suddenly rising and suddenly falling and has decisive influence to the formation of a major flood peak in the middle yellow river ; the main reasons of concentrated coarse sediment of the river is severe erosive sediment yield, strong sediment transporting capacity and high sediment concentration ; the important influence of frequent or continued storm floods happened in he - long reach especially in coarse sediment concentrated region to the sediment transport of the yellow river and ; along with the increase of harnessing, regional flood trend is becoming smaller but the variation of sediment quantity is not obvious and the reaction of peak discharge and flood runoff of majority tributaries are not sensitive, showing that a general and normal engineering works can not effectively control regional major floods especially the sediment of an extraordinary flood
摘要在前人研究的基礎上分析總結了該區特有的暴雨洪水產沙規律：暴雨是侵蝕產沙的主要動力，暴雨、洪水、泥沙之間存在著必然的關系；洪水發生時間集中，峰高量大，暴漲暴落，對黃河中游大洪峰的形成具有決定性影響；侵蝕產沙強烈而粗泥沙集中，輸沙能力強，洪水含沙量高，是黃河粗泥沙的集中來源地；河龍區間特別是粗泥沙集中來源區頻繁或連續的暴雨洪水對黃河輸沙有重要影響；隨著治理水平的提高，區域洪水有減小趨勢，但泥沙量變化不明顯，大部分支流的洪峰流量、洪水含水量反應不敏感，說明一般規模和水平的治理工程還不能有效控制區域大洪水特別是特大洪水的泥沙。 -
We can learn from the result that adopted the different limited water levers in flood season could raise the benefit of reservoir but not increasing the risk of reservoir at the same time. the risk rate of flood control will increase if the limited water level is raised, but the increased flood control risk will not very large at frequent flood owing to the discharge capacity of reservoir is larger
分析發現，水庫實現分期汛限水位控制，可以在不增加水庫防洪風險的同時提高水庫的興利效益，抬高水庫的汛限水位，防洪風險率會增加，但由於水庫的下泄能力較大，在常遇洪水情況下其防洪風險率增加幅度並不會很大。 -
These mean images reveal not only the synoptic cloud systems but also the mesoscale convective cloud cluster. the long - term high water level of mid - yangtze river and the frequent flood peak of the upper yangtze river from the middle of june to the middle of august in 1998 was caused by the high frequent activity of convection
旬月和季平均雲圖表明，長江上游從6月中旬開始到8月中旬長達兩個多月對流的頻繁發生是「 98洪水」長江上游洪峰多，中游高水位維持時間長的重要原因。 -
The summer climate of north china is wetter with more frequent flood from the 1950s to the 1960s and drier with more frequent drought from the 1980s to the 1990s
夏季華北地區五十年代到六十年代中期氣候偏濕，以雨澇多見；八十年代到九十年代初期氣候偏干，以乾旱多見。
分享友人