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在野外调查工作基础之上 ,分析了宁夏贺兰山东麓一线 1998年 5月 2 0日洪涝灾害的基本灾情及其产生原因 ,并提出了防御洪灾的基本对策 .
Based on the field investigation, this paper analyzes the basic disaster and its causes of flood disasters on the eastern foot of Helan Mountain in Ningxia on May 20, 1998 and puts forward the basic countermeasures to prevent floods.