| 1953-2010年黄土洼天然淤地坝内洪水沉积物粒度旋回特征 |
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| 引用本文： | 颜艳,岳大鹏,李奎,刘鹏.1953-2010年黄土洼天然淤地坝内洪水沉积物粒度旋回特征[J].水土保持通报,2014(6):349-354. |
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| 作者姓名： | 颜艳 岳大鹏 李奎 刘鹏 |
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| 作者单位： | 陕西师范大学 旅游与环境学院, 陕西 西安 710062;陕西师范大学 旅游与环境学院, 陕西 西安 710062;陕西师范大学 旅游与环境学院, 陕西 西安 710062;陕西师范大学 旅游与环境学院, 陕西 西安 710062 |
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| 基金项目： | 国家自然科学基金项目"陕北黄土高原典型小流域近500年来侵蚀产沙量变化研究"(41071012);陕西省水土流失补偿费资助项目 |
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| 摘 要： | 利用137Cs断代技术进行沉积物的测年,结合1953年以来的降雨资料,对黄土洼天然聚湫坝淤地的水成沉积物粒度旋回特征进行了分析。结果表明,坝淤地4 m沉积物是在近百年内形成的,物源比较单一,主要为洪水沉积物;降雨是影响沉积物粒度的主要因素;淤地坝内洪水沉积物粒度以粗粉砂为主,中砂含量很少,没有粗砂;沉积物剖面具有良好的沉积层理,剖面粒度旋回至少记录了42次较大的洪水事件,不同期次洪水沉积物之间粒度变化明显,反映了该区近百年内年流域侵蚀和降水量的变化。
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| 关 键 词： | 洪水沉积物 沉积旋回 粒度 天然聚湫 黄土洼 |
| 收稿时间： | 2013/9/27 0:00:00 |
| 修稿时间： | 2013/12/3 0:00:00 |
Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010 |
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| YAN Yan,YUE Da-peng,LI Kui and LIU Peng.Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010[J].Bulletin of Soil and Water Conservation,2014(6):349-354. |
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| Authors: | YAN Yan YUE Da-peng LI Kui and LIU Peng |
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| Institution: | College of Tourism and Environment Science, Shaanxi Normal University, Xi'an, Shaanxi 710062, China;College of Tourism and Environment Science, Shaanxi Normal University, Xi'an, Shaanxi 710062, China;College of Tourism and Environment Science, Shaanxi Normal University, Xi'an, Shaanxi 710062, China;College of Tourism and Environment Science, Shaanxi Normal University, Xi'an, Shaanxi 710062, China |
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| Abstract: | Dating the sediments age with 137Cs, using rainfall data since 1953, the grain size cycle characteristics of hydatogen sediments in natural check dam of loess depression are analyzed. Results showed that the 4 m depth of sediments was formed in the recently one hundred years, and its material was mainly coming from flood erosion. Rainfall was the main factor affecting the particle size of sediments. Flood sediments was mainly composed of coarse silt, while the ratio of medium sand was low and the coarse sand was not found. The section of sediments had distinct sedimentary layers, which have recorded at least 42 flood events. The grain sizes of flood sediment layer in different periods changed significantly, which showed the rules of watershed erosion and precipitation variation in the recently one hundred years. |
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| Keywords: | flood sediments sedimentary cycle grain size natural check dam loess depression |
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