Preprints
https://doi.org/10.5194/nhess-2017-390
https://doi.org/10.5194/nhess-2017-390
03 Nov 2017
 | 03 Nov 2017
Status: this preprint has been withdrawn by the authors.

Multiply factors driving continual post-wildfire debris flows with varied rainfall thresholds in the Reneyong Valley, southwestern China

Mingfeng Deng, Yong Zhang, Mei Liu, Yuanhuan Wang, Wanyin Xie, and Ningsheng Chen

Abstract. In early June of 2014, wildfire struck the Reneyong Valley in the central Hengduan Mountains of southwestern China. Three days after the wildfire, the first debris flow was triggered in branch No. 3, followed by 2 other debris flows that same year. In August 2015, another debris flow occurred in branches No. 1, No. 2 and No. 3, respectively. Rainfall data from three nearby rain gauges and rainfall totals speculated from debris flow volume suggest the three debris flows in 2014 were generated by isolated convective rainfall. Later, we found that varied rainfall thresholds existed among the branches and that these thresholds might be related to the geological and geomorphic characteristics. The results show that (1) the thresholds of post-fire debris flows tend to increase as time passes; (2) post-fire debris flows in the Reneyong Valley occur with high frequency not only because of the loss of the natural canopy, the occurrences of an ash layer and dry ravels and an increase in soil water repellency but also because of the geology, drainage area, channel gradient and regional arid climate, which may not be affected by wildfire; and (3) the varied rainfall thresholds among the different branches are dependent on the drainage area, as entrainment is controlled by the magnitude of discharge.

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Mingfeng Deng, Yong Zhang, Mei Liu, Yuanhuan Wang, Wanyin Xie, and Ningsheng Chen

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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Mingfeng Deng, Yong Zhang, Mei Liu, Yuanhuan Wang, Wanyin Xie, and Ningsheng Chen
Mingfeng Deng, Yong Zhang, Mei Liu, Yuanhuan Wang, Wanyin Xie, and Ningsheng Chen

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Short summary
Research of the post-wildfire in Reneyong Valley shows: (1) the thresholds of post-fire debris flows was low and tend to increase as time passes; (2) reason for the post-fire debris flows with high frequency lies in an increase in soil water repellency, the soft geology, drainage area, channel gradient and regional arid climate; and (3) the varied rainfall thresholds (low in branch No. 3 and higher in branch No. 1 and No. 2) among the different branches are dependent on the drainage area.
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