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Langhammer, Jakub; Vacková, Tereza

doi:10.1007/978-3-030-03171-8_7

Cited by 2 publications

(2 citation statements)

References 54 publications

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“…According to previous researchers, aerial photographs are one of the most trustworthy sources of data that are used for the detail delineation of flash flood extent (Schumann, Bates, Horritt, Matgen, & Pappenberger, 2009; Yu & Lane, 2006). Moreover, UAV could be used to detect the geomorphic effects of floods with high resolution (Langhammer & Vacková, 2018; Quesada‐Román, Ballesteros‐Cánovas, Granados‐Bolaños, Birkel, & Stoffel, 2020) and to produce high resolution DTM for high‐precision 2D hydraulic simulations (Langhammer, Bernsteinová, & Miřijovský, 2017; Perks, Russell, & Large, 2016). The aerial photographs were provided by the “MotionTeam Photo Press Agency.” High resolution colour images derived from the UAV, were used to delineate the inundated areas of the Olympiada floodplain in detail, by digitizing the flood boundaries.…”

Section: Methodsmentioning

confidence: 99%

An integrated approach of flash flood analysis in ungauged Mediterranean watersheds using post‐flood surveys and unmanned aerial vehicles

Kastridis

Kirkenidis

Sapountzis

2020

Hydrological Processes

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This study analyzes the flash flood event of two ungauged ephemeral streams in Olympiada region (Chalkidiki, North Greece), which occurred at the 21-22 of November 2019. Aim of the study is to reconstruct the specific flash flood event, investigate the causes of flood generation mechanisms, evaluate the performance of SCS-CN hydrological and HEC-RAS hydraulic models, investigate the relation between extreme flash floods and human intervention, using the combination of ground and aerial observations obtained from the field survey and unmanned aerial vehicles (UAVs), respectively. The results of the specific discharge ranged between 9 and 11 m 3 s −1 km 2 , values that are typical for flash flood events in Mediterranean region. The comparison between the observed and simulated values of flood extent showed sufficiently good performance of the hydraulic model (CSI = 82%). However, the statistical analysis of the observed and simulated flood depths displayed a flood depth overestimation by the applied model, despite that the values of the used statistic indexes are acceptable (RMSE = 0.35 m, SD = 0.53, NSE = 0.56, PBIAS = 11.26%). The model overestimation of flood depth was attributed to the DEM low resolution and quality. Ground and aerial observations depicted the alluvial fan activation, the alternation of flow paths and the huge sediment transport. Human intervention in main streams, urban sprawl, wet AMC and sediment transport were among the main factors that contributed to the flash flood generation. This integrated approach revealed the necessity of the constant evaluation and validation of hydrological and hydraulic models in small ungauged Mediterranean watersheds and ephemeral streams. The use of UAVs in combination with ground observations and hydraulic simulation could significantly contribute to the enhanced understanding of flash flood mechanisms, in the direction of flood risk mitigation, improvement of the planning efficiency of flood prevent measures, flood hazard estimation, evolution of flood warning systems and floodplain geomorphology analysis.

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Section: Methodsmentioning

confidence: 99%

An integrated approach of flash flood analysis in ungauged Mediterranean watersheds using post‐flood surveys and unmanned aerial vehicles

Kastridis

Kirkenidis

Sapountzis

2020

Hydrological Processes

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“…When coupled with hydraulic modeling, such imagery can even be used to quantify stream discharge (King, Neilson, & Rasmussen, 2018). The burgeoning use of unmanned aerial vehicles (drones) to capture imagery is therefore quite promising (Langhammer & Vacková, 2018; Spence & Mengistu, 2016), though challenges related to regulation, sensors, canopy cover, and data processing still remain (Whitehead & Hugenholtz, 2014). In addition, aerial imagery or high‐resolution satellite data often only represent coarse snapshots in time, which makes it difficult to capture the dynamic nature of many flashy non‐perennial river systems.…”

Section: Key Challenges In Measuring and Modeling The Hydrologic Processes Of Non‐perennial Riversmentioning

confidence: 99%

An overview of the hydrology of non‐perennial rivers and streams

et al. 2021

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Non‐perennial rivers and streams are ubiquitous on our planet. Although several metrics have been used to statistically group or compare streamflow characteristics, there is currently no widely used definition of how many days or over what reach length surface flow must cease in order to classify a river as non‐perennial. At the same time, the breadth of climate and geographic settings for non‐perennial rivers leads to diversity in their flow regimes, such as how often or how quickly they go dry. These rivers have a rich and expanding body of literature addressing their ecologic and geomorphic features, but are often said to be ignored by hydrologists. Yet there is much we do know about their hydrology in terms of streamflow generation processes, water losses, and variability in flow. We also know that while they are prevalent in arid regions, they occur across all climate types and experience a diverse set of natural and anthropogenic controls on streamflow. Furthermore, measuring and modeling the hydrology of these rivers presents a distinct set of challenges, and there are many research directions, which still require further attention. Therefore, we present an overview of the current understanding, methodologic challenges, knowledge gaps, and research directions for hydrologic understanding of non‐perennial rivers; critical topics in light of both growing global water scarcity and ever‐changing laws and policies that dictate whether and how much environmental protection these rivers receive. This article is categorized under: Science of Water > Science of Water

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Untitled

Cited by 2 publications

References 54 publications

An integrated approach of flash flood analysis in ungauged Mediterranean watersheds using post‐flood surveys and unmanned aerial vehicles

An integrated approach of flash flood analysis in ungauged Mediterranean watersheds using post‐flood surveys and unmanned aerial vehicles

An overview of the hydrology of non‐perennial rivers and streams

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