EGU2020-3251, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-3251
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Riverine Flooding and Landfalling Tropical Cyclones over China

Long Yang1, Maofeng Liu2,3, Lachun Wang1, Xiaomin Ji1, Xiang Li4,5, and Aizhong Hou6
Long Yang et al.
  • 1School of Geography and Ocean Science, Nanjing University, Nanjing, China
  • 2Department of Civil and Environmental Engineering, Princeton University, Princeton, USA
  • 3Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, USA
  • 4State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
  • 5State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, China
  • 6Hydrology Bureau, Ministry of Water Resources, Beijing, China

Riverine flooding associated with landfalling tropical cyclones (TCs) in the Western North Pacific basin is responsible for some of the most severe socioeconomic losses in East Asian countries. However, little is known about the spatial and temporal patterns of TC flooding and its synoptic controls, which constrain predictive understandings of flood risk in this highly populated region. In this study, we investigate hydrology, hydrometeorology, and hydroclimatology of riverine flooding over China induced by landfalling tropical cyclones, based on empirical analysis of dense networks of stream gauging and rainfall stations as well as downscaling simulations using the Weather Research and Forecasting (WRF) model driven by 20th Century Reanalysis fields. The most extreme floods in central and northeastern China are associated with TCs despite infrequent TC visits in these regions. Inter-annual variations in TC flooding demonstrate a mixture of climate controls tied to surface temperature anomalies in central tropical Pacific, western North Pacific and north Atlantic. We implement numerical modelling analysis of typhoon Nina (1975), typhoon Andy (1982) and typhoon Herb (1996) to further shed light on key hydro-meteorological features of landfalling TCs that are responsible for severe flooding over China. We highlight the important role of interactions of storm circulations with mid-latitude synoptic systems (e.g., upper-level trough) and complex terrains in producing extreme rain rates and flooding. Analytical framework developed in this study aims to explore utilization of hydro-meteorological approach in flood-control engineering designs by providing details on the key elements of flood-producing storms. We also highlight potential challenges of developing predictive tools of TC flood risk in east Asian countries.

How to cite: Yang, L., Liu, M., Wang, L., Ji, X., Li, X., and Hou, A.: Riverine Flooding and Landfalling Tropical Cyclones over China, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-3251, https://doi.org/10.5194/egusphere-egu2020-3251, 2020

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