Abstract
There are several basins with high sediment yield in the Pisha-sandstone covering area of the east wing of the Ordos Plateau. Due to the lack of targeted research on the dynamical characteristics of geomorphic evolution that plays an important role in the sand production, this paper analyzed the tectonic activity intensity and erosion characteristics of the area. The results show that the intensity of tectonic activities in the area is generally moderateweak and shows an unconspicuous increase from north to south. Tectonic activity is manifested mainly in the form of uplift. The uplift rate in the lower reaches of each basin is greater than the erosion rate, which is prominent in the Kuyehe and the Tuweihe rivers. During the uplift of the regional topography, the most serious parts under erosion are generally concentrated in the upstream and midstream of basins. All longitudinal profiles of the basins have a shape close to an exponential function, which indicates that they are in the early stage of erosion evolution. The mechanisms of geomorphologic evolution of these basins have a great similarity. The conservative estimate of historical average erosion rate was less than 182–520 t/(km²·yr), much less than that of the modern times. The average stream power values are typically distributed between 4 and 102 W/m, with the larger being in the Kuyehe and the Tuweihe rivers and the smallest being in the Qinshuihe River. The maximum stream power value appears in the downstream reach, which should be the main reason for the particles being directly injected into the Yellow River. From the perspective of geomorphological evolution, the current soil and water conservation measures can hardly cure the erosion of these basins in the long run.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 41671004). We are very grateful to the three anonymous reviewers and the editors for their detailed and valuable suggestions.
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Gu, Zk., Shi, Cx. Dynamical characteristics of geomorphologic evolution of the basins covered by Pisha-sandstone in the eastern wing of the Ordos Plateau, China. J. Mt. Sci. 15, 1046–1056 (2018). https://doi.org/10.1007/s11629-018-4859-8
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DOI: https://doi.org/10.1007/s11629-018-4859-8