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Mr. Thanh Thi Luong
TU Dresden

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Research Keywords & Expertise

0 Soil moisture
0 flood risk management
0 Flash flood
0 process modeling and optimization
0 water balance simulation

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Preprint content
Published: 18 June 2021
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Water balance estimation/modeling is highly dependent on good-quality precipitation data and often lacks enough spatial information about it. Quantitative precipitation estimation (QPE) using radar data is recognized to have a good potential to significantly enhance the spatial depiction of precipitation compared to conventional rain gauge-based methods. However, precipitation measurements are often underestimated by wind drift or funnel evaporation, so that a correction such as Richter’s method is required before the data can be applied in the model. In this study, the Richter correction is applied for the first time to a radar-based QPE, namely RADKLIM-RW, to model water balance in ten selected catchments in Saxony, Germany. The modelled water balance components for the period 2001-2017 were evaluated by means of comparison of radar- and gauge-based precipitation inputs. The results showed that RADKLIM-RW was able to produce reliable simulations of discharge and water balance (KGE = 0.56 and 0.71 on the daily and monthly scales respectively). Application of the Richter correction improved the model performance by 5.5% and 8.9 % (for rain gauge-based and RADKLIM precipitation respectively). The study concluded that radar data as precipitation input to (pseudo)distributed hydrologic model shows immense potential to improve water balance simulations.

Hightlights:

  • Comparison of precipitation derived from sensor networks and radar imagery for small catchments
  • Evaluation of potential application of radar precipitation in water balance simulation at regional scale
  • Effect of wind correction (“Richter” correction) on radar precipitation products
  • Evaluating corrected precipitation on water balance processes

Keywords: HRU, radar climatology, RADKLIM RW (RADOLAN), Richter correction, Open sensor network, water balance simulation, BROOK90

ACS Style

Thanh Thi Luong; Ivan Vorobevskii; Judith Pöschmann; Rico Kronenberg. Evaluation of the use of radar-derived precipitation in water balance simulations: A case study in small-medium catchments in Saxony, Germany. 2021, 1 .

AMA Style

Thanh Thi Luong, Ivan Vorobevskii, Judith Pöschmann, Rico Kronenberg. Evaluation of the use of radar-derived precipitation in water balance simulations: A case study in small-medium catchments in Saxony, Germany. . 2021; ():1.

Chicago/Turabian Style

Thanh Thi Luong; Ivan Vorobevskii; Judith Pöschmann; Rico Kronenberg. 2021. "Evaluation of the use of radar-derived precipitation in water balance simulations: A case study in small-medium catchments in Saxony, Germany." , no. : 1.

Journal article
Published: 12 April 2021 in Water
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Convective rainfall can cause dangerous flash floods within less than six hours. Thus, simple approaches are required for issuing quick warnings. The flash flood guidance (FFG) approach pre-calculates rainfall levels (thresholds) potentially causing critical water levels for a specific catchment. Afterwards, only rainfall and soil moisture information are required to issue warnings. This study applied the principle of FFG to the Wernersbach Catchment (Germany) with excellent data coverage using the BROOK90 water budget model. The rainfall thresholds were determined for durations of 1 to 24 h, by running BROOK90 in “inverse” mode, identifying rainfall values for each duration that led to exceedance of critical discharge (fixed value). After calibrating the model based on its runoff, we ran it in hourly mode with four precipitation types and various levels of initial soil moisture for the period 1996–2010. The rainfall threshold curves showed a very high probability of detection (POD) of 91% for the 40 extracted flash flood events in the study period, however, the false alarm rate (FAR) of 56% and the critical success index (CSI) of 42% should be improved in further studies. The proposed adjusted FFG approach has the potential to provide reliable support in flash flood forecasting.

ACS Style

Thanh Luong; Judith Pöschmann; Rico Kronenberg; Christian Bernhofer. Rainfall Threshold for Flash Flood Warning Based on Model Output of Soil Moisture: Case Study Wernersbach, Germany. Water 2021, 13, 1061 .

AMA Style

Thanh Luong, Judith Pöschmann, Rico Kronenberg, Christian Bernhofer. Rainfall Threshold for Flash Flood Warning Based on Model Output of Soil Moisture: Case Study Wernersbach, Germany. Water. 2021; 13 (8):1061.

Chicago/Turabian Style

Thanh Luong; Judith Pöschmann; Rico Kronenberg; Christian Bernhofer. 2021. "Rainfall Threshold for Flash Flood Warning Based on Model Output of Soil Moisture: Case Study Wernersbach, Germany." Water 13, no. 8: 1061.

Preprint
Published: 05 March 2021
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Convective rainfall can cause dangerous flash floods within less than six hours. Thus, simple approaches are required for issuing quick warnings. The Flash Flood Guidance (FFG) approach pre-calculates rainfall levels (thresholds) potentially causing critical water levels for a specific catchment. Afterwards, only rainfall and soil moisture information is required to issue warn-ings. This study applied the principle of FFG to the Wernersbach Catchment (Germany) with excellent data coverage using the BROOK90 water budget model. The rainfall thresholds were determined for durations of 1 to 24 hours, by running BROOK90 in “inverse” mode, identifying rainfall values for each duration that led to exceedance of critical discharge (fixed value). After calibrating the model based on its runoff, we ran it in hourly mode with four precipitation types and various levels of initial soil moisture for the period 1996 – 2010. The rainfall threshold curves showed a very high probability of detection (POD) of 91% for the 40 extracted flash flood events in the study period, however, the false alarm rate (FAR) of 56% and the critical success index (CSI) of 42% should be improved in further studies. The approach proved potential as an early flood indicator for head-catchments with limited available information.

ACS Style

Thanh Thi Luong; Judith Pöschmann; Rico Kronenberg; Christian Bernhofer. Rainfall Threshold for Flash Flood Warning Based on Model Output of Soil Moisture: Case Study Wernersbach, Germany. 2021, 1 .

AMA Style

Thanh Thi Luong, Judith Pöschmann, Rico Kronenberg, Christian Bernhofer. Rainfall Threshold for Flash Flood Warning Based on Model Output of Soil Moisture: Case Study Wernersbach, Germany. . 2021; ():1.

Chicago/Turabian Style

Thanh Thi Luong; Judith Pöschmann; Rico Kronenberg; Christian Bernhofer. 2021. "Rainfall Threshold for Flash Flood Warning Based on Model Output of Soil Moisture: Case Study Wernersbach, Germany." , no. : 1.

Journal article
Published: 09 November 2020 in Hydrology
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Highly-resolved data on water balance components (such as runoff or storage) are crucial to improve water management, for example, in drought or flood situations. As regional observations of these components cannot be acquired adequately, a feasible solution is to apply water balance models. We developed an innovative approach using the physically-based lumped-parameter water balance model BROOK90 (R version) integrated into a sensor network platform to derive daily water budget components for catchments in the Free State of Saxony. The model is not calibrated, but rather uses available information on soil, land use, and precipitation only. We applied the hydro response units (HRUs) approach for 6175 small and medium-sized catchments. For the evaluation, model output was cross-evaluated in ten selected head catchments in a low mountain range in Saxony. The mean values of Kling–Gupta efficiency (KGE) for the period 2005–2019 to these catchments are 0.63 and 0.75, for daily and monthly discharge simulations, respectively. The simulated evapotranspiration and soil wetness are in good agreement with the SMAP_L4_GPH product in April 2015–2018. The study can be enhanced by using different data platforms as well as available information on study sites.

ACS Style

Thanh Thi Luong; Judith Pöschmann; Ivan Vorobevskii; Stefan Wiemann; Rico Kronenberg; Christian Bernhofer. Pseudo-Spatially-Distributed Modeling of Water Balance Components in the Free State of Saxony. Hydrology 2020, 7, 84 .

AMA Style

Thanh Thi Luong, Judith Pöschmann, Ivan Vorobevskii, Stefan Wiemann, Rico Kronenberg, Christian Bernhofer. Pseudo-Spatially-Distributed Modeling of Water Balance Components in the Free State of Saxony. Hydrology. 2020; 7 (4):84.

Chicago/Turabian Style

Thanh Thi Luong; Judith Pöschmann; Ivan Vorobevskii; Stefan Wiemann; Rico Kronenberg; Christian Bernhofer. 2020. "Pseudo-Spatially-Distributed Modeling of Water Balance Components in the Free State of Saxony." Hydrology 7, no. 4: 84.

Preprint
Published: 19 October 2020
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Highly-resolved data on water balance components (like runoff or storage) are crucial to improve water management, e.g., in drought or flood situations. Because regional observations of these components cannot be acquired adequately, applying water balance models is a feasible solution. We developed an innovative approach using the physically-based lumped-parameter water balance model BROOK90 (R version) integrated into a sensor network platform to derive daily water budget components for catchments in the Free State of Saxony. The model is not calibrated but rather uses available information on soil, land use and precipitation only. We applied the hydro response units (HRUs) approach for 6175 small and medium-sized catchments. For the evaluation, model output was cross-evaluated in ten selected head catchments in a low mountain range in Saxony. The mean values of Kling-Gupta efficiency (KGE) for the period 2005-2019 to these catchments are 0.63 and 0.75 for daily and monthly discharge simulations, respectively. The simulated evapotranspiration and soil wetness are in good agreement with the SMAP_L4_GPH product in April 2015-2018. The study can be enhanced by using different data platforms as well as available information on study sites.

ACS Style

Thanh Thi Luong; Judith Poeschmann; Ivan Vorobevskii; Stefan Wiemann; Rico Kronenberg; Christian Bernhofer. Pseudo-Spatially-Distributed Modeling of Water Balance Components in the Free State of Saxony. 2020, 1 .

AMA Style

Thanh Thi Luong, Judith Poeschmann, Ivan Vorobevskii, Stefan Wiemann, Rico Kronenberg, Christian Bernhofer. Pseudo-Spatially-Distributed Modeling of Water Balance Components in the Free State of Saxony. . 2020; ():1.

Chicago/Turabian Style

Thanh Thi Luong; Judith Poeschmann; Ivan Vorobevskii; Stefan Wiemann; Rico Kronenberg; Christian Bernhofer. 2020. "Pseudo-Spatially-Distributed Modeling of Water Balance Components in the Free State of Saxony." , no. : 1.

Journal article
Published: 23 December 2019 in Water
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There is a lack of information about the effect of climate change on the water budget for the eastern side of Colombia, which is currently experiencing an increased pressure on its water resources due to the demand for food, industrial use, and human demand for drinking and hygiene. In this study, the lumped model BROOK90 was utilized with input based on the available historical and projected meteorological data, as well as land use and soil information. With this data, we were able to determine the changes in the water balance components in four different regions, representing four different water districts in Eastern Colombia. These four regions reflect four different sets of climate and geographic conditions. The projected data were obtained using the Statistical Downscaling Model (SDSM), in which two global climate models were used in addition to two different climate scenarios from each. These are the Representative Concentration Pathways (RCP) RCP 2.6 and RCP 8.5. Results showed that the temporal and spatial distribution of water balance components were considerably affected by the changing climate. A reduction in the generated streamflow for all of the studied regions is shown and changes in the evapotranspiration and stored water were varied for each region according to both the climate scenario as well as the characteristics of soil and land use for each area. The results of spatial change of the water balance components showed a direct link to the geography of each region. Soil moisture was reduced considerably in the next decades, and the percentage of decrease varied for each scenario.

ACS Style

Oscar Molina; Thi Thanh Luong; Christian Bernhofer. Projected Changes in the Water Budget for Eastern Colombia Due to Climate Change. Water 2019, 12, 65 .

AMA Style

Oscar Molina, Thi Thanh Luong, Christian Bernhofer. Projected Changes in the Water Budget for Eastern Colombia Due to Climate Change. Water. 2019; 12 (1):65.

Chicago/Turabian Style

Oscar Molina; Thi Thanh Luong; Christian Bernhofer. 2019. "Projected Changes in the Water Budget for Eastern Colombia Due to Climate Change." Water 12, no. 1: 65.