![]() The results prove the validity of the proposed calculation method moreover, this study shows that the new method is accurate, easy to operate, and highly efficient for visualizing the spatial distribution of the siltation depth behind the check dam. The design capacity of the check dam is 33.6× 104 m³, and the actual capacity is 36.7× 104 m³, with an absolute error of 3.1× 104 m³ and relative error of 8.6%. The accuracy of the calculation results was evaluated using the checkpoint method, and the results showed that the design and measured siltation surface errors ranged from −1.16–2.96 m, with a root mean square error of 0.93 m. This study uses the newly proposed method to calculate the design storage capacity of the check dam. The measured storage capacity of the check dam is determined by analyzing the DEM differences. Large-scale digital surface models derived from unmanned aerial vehicle imagery and ground surveys identify local topographic changes in the debris flow path and develop appropriate maintenance plans for check dams. This paper proposes a new method that uses GIS to calculating the design storage capacity of a check dam in the debris flow-prone Cutou Gully in Wenchuan County, China. ![]() Despite their prevalence in debris flow-prone areas worldwide, the capacity of check dams is still calculated using empirical formulas, which lead to large calculation errors. We found that this was also the case for the afforestation and permeable concrete.ĭebris flows are a common natural trigger of disasters in mountainous areas, and check dams are standard structural measures for controlling debris flows. ![]() This means that while these measures can have significant local effects, they may have only a minor impact at larger scales. However, the results of this study show that reservoir effects quickly reduce with scale. On the other hand, dry and wet retention reservoirs could provide more significant peak discharge reductions if appropriate locations are available, such reservoirs could be implemented at acceptable costs for decision makers. The costs related to the implementation of such measures could be relatively high, and may become even higher than the potential benefits related to the multifunctionality and multi-purpose opportunities of such measures. Results showed that in the case of afforestation and permeable concrete, large areas are required to achieve notable peak discharge reduction (from a catchment scale point of view). Additionally, the effect of dry and wet reservoirs was investigated at a larger (catchment) scale. In this study, afforestation, permeable concrete implementation, and the use of dry and wet retention reservoirs were tested as possible options for urban flood risk reduction in a case study involving the Glinščica river catchment (Slovenia). Therefore, the effects of different flood risk management options need to be evaluated. Floods are among the most frequent and deadliest natural disasters, and the magnitude and frequency of floods is expected to increase.
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