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首页> 外文会议>Sediment dynamics for a changing future >Historic sediment yields in a small ungauged catchment controlled by a warping dam, using sediment deposition information and ~(137)Cs dating
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Historic sediment yields in a small ungauged catchment controlled by a warping dam, using sediment deposition information and ~(137)Cs dating

机译：利用沉积物沉积信息和〜（137）Cs测年，在由翘曲大坝控制的小型未排水流域的历史沉积物产量

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摘要

In the hilly and gully region of the Loess Plateau, China, warping (check) dams are one of the most important engineering measures for controlling soil and water loss, and reducing downstream sediment yields. Based on detailed field observations, the sediment profile upstream of the third warping dam, located in a small ungauged watershed (Guandigou) of the Wangmaogou catchment, was divided into 31 sedimentary layers, and the sediment thickness and ~(137)Cs activity of each layer were measured. Peaks in ~(137)Cs activity in the sediment layers were equated to 1963 (peak in fallout) and 1986 (Chernobyl incident). These dated layers, in combination with historical information on erosive rainstorm events, were used to date the timing of sediment deposition for each layer. Based on the information on sediment thickness for the 31 layers, and field measurements of the surface area of each layer, the specific sediment yields from 1959 to 1987 were estimated. The results indicated that the approach, I.e. the combination of ~(137)Cs dating and the sediment record deposited upstream of a warping dam, could be used to study soil erosion and deposition in small ungauged watersheds in the Loess Plateau region of China.
机译：在中国黄土高原的丘陵沟壑区，翘曲（止水）大坝是控制水土流失，降低下游泥沙产量的最重要的工程措施之一。根据详细的实地观察，位于望帽沟流域的一个小无灌流域（关帝沟）的第三条翘曲坝上游的沉积物剖面分为31个沉积层，每个沉积物的沉积物厚度和〜（137）Cs活度测量层。沉积层中〜（137）Cs活性的峰值分别等于1963年（落尘峰）和1986年（切尔诺贝利事件）。这些标注日期的图层，结合有关暴雨暴雨事件的历史信息，用于确定每一图层的沉积时间。根据有关31层沉积物厚度的信息以及每层表面积的实地测量，估算了1959年至1987年的特定沉积物产量。结果表明该方法即〜（137）Cs测年与翘曲坝上游沉积物记录的结合，可用于研究中国黄土高原未灌水小流域的土壤侵蚀和沉积。

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