Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
An Analysis of Sediment Sources and Water–Sediment Retarding Effects of Check Dams
Each small basin in the Loess Plateau is an independent erosion sediment unit. The study of the law of erosion sediment in small basins is of great significance for establishing a basin‐scale erosion prediction model and also provides effective theoretical guidance for optimizing slope‐gully management structures. Based on the measured silt layer thickness, 137 Cs content, soil particle size and historical rainfall data in different typical watersheds, the sediment sources and water–sediment retarding effects of check dams were analyzed. The results showed that (i) the sediment was mainly the result of a few heavy rainfall events each year. The erosion rainfall events with a daily rainfall of more than 30.0 mm, accounting for 57.1% of the total rainfall events, contributed 72.4% of the total sediment in the Yuanzigou basin. An average annual erosion modulus was 10 147 t/(km 2 ·a) from 2007 and 2016 in the Yuanzigou basin. Eroded sediment from gullies was the main source of sediment in the Yuanzigou dam, with an average proportion of 71.4%; eroded sediment from the land between gullies accounted for only 28.6%. Gully wall was also the main sediment source area (the mean value was 53.60%) in the Zhaizimao check dam control area. Totally, 69% of the sediment in the Nianyangou basin came from slope farmland, and the sediment from forest‐shrub land, grassland, and terraced fields was relatively low, accounting for 3, 13, and 14%, respectively. (ii) Check dam construction played an important role in peak reduction and flood detention during the heavy rain on July 26. The check dams with drainage and water discharge buildings had fewer dam breaks and many of them were in good condition. Almost 80% of the upstream erosion sediment was controlled by the key dam during the rainstorm flood in Suide on July 15.
An Analysis of Sediment Sources and Water–Sediment Retarding Effects of Check Dams
Each small basin in the Loess Plateau is an independent erosion sediment unit. The study of the law of erosion sediment in small basins is of great significance for establishing a basin‐scale erosion prediction model and also provides effective theoretical guidance for optimizing slope‐gully management structures. Based on the measured silt layer thickness, 137 Cs content, soil particle size and historical rainfall data in different typical watersheds, the sediment sources and water–sediment retarding effects of check dams were analyzed. The results showed that (i) the sediment was mainly the result of a few heavy rainfall events each year. The erosion rainfall events with a daily rainfall of more than 30.0 mm, accounting for 57.1% of the total rainfall events, contributed 72.4% of the total sediment in the Yuanzigou basin. An average annual erosion modulus was 10 147 t/(km 2 ·a) from 2007 and 2016 in the Yuanzigou basin. Eroded sediment from gullies was the main source of sediment in the Yuanzigou dam, with an average proportion of 71.4%; eroded sediment from the land between gullies accounted for only 28.6%. Gully wall was also the main sediment source area (the mean value was 53.60%) in the Zhaizimao check dam control area. Totally, 69% of the sediment in the Nianyangou basin came from slope farmland, and the sediment from forest‐shrub land, grassland, and terraced fields was relatively low, accounting for 3, 13, and 14%, respectively. (ii) Check dam construction played an important role in peak reduction and flood detention during the heavy rain on July 26. The check dams with drainage and water discharge buildings had fewer dam breaks and many of them were in good condition. Almost 80% of the upstream erosion sediment was controlled by the key dam during the rainstorm flood in Suide on July 15.
An Analysis of Sediment Sources and Water–Sediment Retarding Effects of Check Dams
Li, Zhanbin (Herausgeber:in) / Li, Peng (Herausgeber:in) / Yu, Yang (Herausgeber:in) / Shi, Peng (Herausgeber:in) / Piton, Guillaume (Herausgeber:in) / Xu, Guoce (Autor:in) / Li, Tanbao (Autor:in) / Wang, Jibin (Autor:in) / Bai, Lulu (Autor:in) / Yu, Kunxia (Autor:in)
01.08.2022
37 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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