摘要
根据咸阳渭河河漫滩剖面上48个样品的激光粒度分析,研究了咸阳渭河距今70年以来的洪水深度、洪水变化阶段和气候变化。资料表明,距今70年以来,咸阳渭河河漫滩沉积物厚度为91cm左右,成分主要为粗粉砂和极细砂,共包括9个明显的沉积层。这9个沉积层清楚地反映了9个大洪水阶段,而且渭河流域的降水量呈逐渐减少趋势,气候趋于干旱。
According to the laser grain size analysis for 45 samples of the river deposit,the flood depth,flood level distribution and climatic change of Weihe River in Xianyang over the past 70 years were discussed.The materials showed that over the past 70 years,the deposit of Weihe River was about 91cm in thickness and it consisted of silt layers and silver sand layer,9 obvious deposit layers occurred.These 9 layers clearly indicated the 9 stages of the large scale flood,and the rainfall in the drainage area of Weihe River was reducing and the climate was dryer.
出处
《安徽农业科学》
CAS
北大核心
2010年第22期11995-11997,12035,共4页
Journal of Anhui Agricultural Sciences
基金
陕西师范大学历史地理国家重点学科项目(SNNUHG04007)
教育部重大招标项目(04JAZJD770016)
关键词
渭河
洪水变化
气候变化
Weihe River
Flood change
Climatic change
