11 Jul 2022
11 Jul 2022
Status: this preprint is currently under review for the journal NHESS.

Assessment of Short-medium Term Intervention Effects Using CAESAR-Lisflood in Post-earthquake Mountainous Area

Di Wang1,2,3, Ming Wang1, and Kai Liu1 Di Wang et al.
  • 1School of National Safety and Emergency Management, Beijing Normal University, Beijing, China
  • 2Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing, China
  • 3Faculty of Geographical Science, Beijing Normal University, Beijing, China

Abstract. The 2008 Wenchuan earthquake triggered local geomorphic changes rapidly and gradually and produced abundant materials through external processes. The abundant materials increased the risks of geomorphic hazards (flash floods, landslides, and debris flows) induced by extreme precipitation in the area. To reduce sediment transport present in geomorphic hazards, intervention measures such as dams, levees, and vegetation revetments have been constructed in specified sites.

This study concentrated on the assessment of intervention effects incorporated with various facilities on post-earthquake fragile mountains in the short-medium term. Take the Xingping valley as an example, we used the CAESAR-Lisflood landscape evolution model to simulate three different scenarios including unprotected landscapes, present protected landscapes, and enhanced protected landscapes in 2011–2013. We compared the geomorphic changes and defined two indicators to assess the intervention effects.

The results showed that the mitigation facilities were effective, especially engineering measures that cooperated with vegetation revetments in the upstream area, and the present mitigation measures were inadequate to stop materials loss and prevent hazards from the upstream area. Moreover, the effectiveness reduced gradually caused by the storage capacity of dams decreased. The simulation methods assessed the ability and effectiveness of cooperated control measures and could support optimum mitigation strategies.

Di Wang et al.

Status: open (until 22 Aug 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2022-195', Jorge Ramirez, 04 Aug 2022 reply
  • RC2: 'Comment on nhess-2022-195', Anonymous Referee #2, 08 Aug 2022 reply

Di Wang et al.

Di Wang et al.


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Short summary
The short-medium term intervention effect on the post-earthquake area was analyzed by simulation in different scenarios. The sediment transport patterns varied in different sub-regions. And the relative effectiveness in different scenarios changed over time with a general downward trend, where the steady stage implicated the scenario with more facilities performed better in controlling sediment output. Therefore, the simulation methods could support optimal rehabilitation strategies.