The effect of moving rainstorm in increasing river discharge in Ciliwung basin, case study: 15-16 January 2013 flood events

Lugina, Fikry Purwa; Riawan, Edi; Renggono, Findy

doi:10.1063/1.5047338

Cited by 1 publication

(1 citation statement)

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“…They concluded that design events with return periods greater than 5-year are needed for the UHPF to fall within the guidance range and that UHPF becomes less sensitive to rainfall intensity with increasing accumulation time. Lugina et al (2018) analyzed the effect of moving rainstorms in increasing peak discharge in the 2013 flood event in Ciliwung Rivers Basin (CRB) based on 13 scenarios of synthetic rain, including three scenarios for nonmoving rainfall and ten scenarios of the moving rainfall to-downstream or to-upstream direction, which all based on the equivalent volume. The GSSHA hydrological simulation was conducted, and the results showed that moving rainfall has important effects in increasing the peak discharge and decreasing time to peak discharge in CRB.…”

Section: Introductionmentioning

confidence: 99%

An innovative approach of GSSHA model in flood analysis of large watersheds based on accuracy of DEM, size of grids, and stream density

et al. 2022

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Distributed modeling approach may have much better performance and accuracy compared with lumped-parameter hydrologic models. The main goals of this research are: investigating the possibility of combining distributed hydrological models with an one-dimensional hydraulic model and simulating waterways in large watersheds with limited hydrological and hydraulic data. Then performing sensitivity analysis on different parameters in order to identify the parameters containing the major influences on results. In the current research, an innovative approach in Gridded Surface Subsurface Hydrologic Analysis (GSSHA) model, the cross-sections of all 414 waterways in the 3450 km2 Karvandar watershed, used for flow routing calculations, are uniquely extracted. Then, the effect of three essential factors are evaluated. These factors are accuracy of the digital topographic model, cell size of grid network, and density of streams, on the results of GSSHA model simulations. This watershed is located in southeastern Iran, has a dry climate with limited available hydrological data. Results showed that peak discharges obtained from the GSSHA model, developed based on a DEM with a spatial resolution of 12.5 m, are slightly (< 4%) lower than the corresponding values in the GSSHA model with a 30 m DEM resolution. This fact confirms that the use of the topographic model with a lower spatial resolution has no substantial effects on the accuracy of simulation. Also, the peak discharges increased significantly (44% to 57%) by increasing the density of waterways in the GSSHA model. Furthermore, results showed that peak discharge obtained from three models with grid cell sizes of 100, 150, and 200 m (base model), are close together. Comparing with two models of coarser grids (250 and 300 m), significant differences observed, which indicated that the grids larger than 200 m could induce substantial errors in results.

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Section: Introductionmentioning

confidence: 99%