Optimization of the rehabilitation of the Emscher drainage system using continuous rainfall-runoff-modeling

1997 ◽  
Vol 36 (8-9) ◽  
pp. 33-37
Author(s):  
E. Pfeiffer ◽  
M. Simon
Keyword(s):  
Water Resources ◽  
Flood Control ◽  
Anthropogenic Impacts ◽  
Control Strategies ◽  
Drainage System ◽  
Storm Event ◽  
Rainfall Runoff ◽  
Actual System ◽  
Rainfall Runoff Model ◽  
Set Up

The northbound migration of maining activities in the Emscher Region is making the open combined sewer system obsolete. This complex task requires a large number of water resources development activities in the subcatchments of tributaries. To harmonize these single activities and to evaluate their performance as part of the complete system a detailed rainfall-runoff-model of the whole Emscher system has been set up. Intensive anthropogenic impacts made it necessary to use actual system data to run advanced modeling techniques. The model set-up and first applications have been recently completed. The reconstruction of the extreme storm event of January 1995 showed excellent results. One of the major objectives is the reduction of flood levels by decentral retention measures. An evaluation matrix will be set up for the 22 potential sites for flood storage with a total volume of 4.8 million m3. Reconstruction plans developed through interdisciplinary investigations will be ranked concerning potential for realization and water resources benefits. In the mean and long range the applicability of approaches for flood control strategies using real-time forecasting models will be checked.

ESTIMATION DES DEBITS DU FLEUVE OUEME A L’EXUTOIRE DE AHLAN A PARTIR DE DEUX MODELES HYDROLOGIQUES POUR LA PREVISION DES CRUES

2020 ◽  
Vol 7 (10) ◽  
pp. 518-530
Author(s):  
MONGBO F. A. BRICE ◽  
AMOUSSOU ERNEST ◽  
CLEDJO F. G. A. PLACIDE
Keyword(s):  
Hydrological Regime ◽  
Management Tool ◽  
Rainfall Runoff ◽  
Learning Time ◽  
Rainfall Runoff Model ◽  
Set Up ◽  
Runoff Model

The river Oueme is the longest river in Benin with a watershed covering more than 40% of the country's surface. The hydrological regime of the river Oueme is irregular and is characterized by an alternation of strong floods and severe low water. The morphodynamics of the study area from the source to the Ahlan outlet favored rapid flows in the basin. Thus, we are witnessing a recurrence of flooding in the delta. A rainflow- rainflow and rainfall- rainflow modeling was set up to develop a tool for estimating the flows required for the sizing of the structures. It emerges from these results that the rainfall- rainflow and rainflow-rainflow models presented Nash values ​​greater than 0.90 both in setting and in validation. Which testifies to the efficiency of the models. However, for this work, the rainfall-runoff model was chosen because of the relatively longer learning time. From these results, a management tool was developed for the recovery of water from overflows in the basin for economic purposes.

scholarly journals Time of concentration for large catchment based on hydrodynamic modelling

2018 ◽  
Vol 250 ◽  
pp. 04002
Author(s):  
Hassan Abd Jalil ◽  
Harun Sobri ◽  
Ismail Tarmizi
Keyword(s):  
Rainfall Intensity ◽  
River Channel ◽  
Storm Event ◽  
Hydrodynamic Modelling ◽  
Rainfall Runoff ◽  
Initial Water ◽  
Travelling Time ◽  
Rainfall Runoff Model ◽  
Runoff Model ◽  
Large Catchment

Flood mitigation design requires accurate computation of discharge at any interest location to sustain the protection level. The design flood hydrograph generates from rainfall runoff model which used unit hydrograph method depends on the time of concentration (Tc) of the catchment. Common factors which influence Tc are the catchment properties including length, slope, soil properties and surface cover. However, when dealing with large catchment, more complex factors which also requires attention are the rainfall intensity, catchment wetness and initial water in the channel due to rain prior to the storm event. For large catchment, the travelling time which govern the Tc is more dominant in the channel rather than on the soil surface. Since water flowing in the river channel is unsteady and nonuniform, the use of Manning formula is inappropriate. This paper explains the application of hydrodynamic modelling approach to determine Tc for large catchment with long river channel. A hydrodynamic river model for Sg Relai, Kelantan with area of 460 km2 and covering 90 km distance was developed using InfoWorks ICM. Results shown that as the rain intensity increased, the travelling time will be shortened. The traveling time also reduce when initial water level in the channel increase which indicate that Tc will reduce if the catchment already received some rainfall prior to the storm event. Based on this analysis and results, the use of hydrodynamic model as part of the rainfall runoff model is significant for large catchment to handle complex factor such as wide range of rainfall intensity, spatial effect and catchment wetness.

Perhitungan ketersediaan air permukaan di Indonesia berdasarkan data satelit

2018 ◽  
Vol 13 (2) ◽  
pp. 115-130 ◽  
Author(s):  
Radhika Radhika ◽  
Rendy Firmansyah ◽  
Waluyo Hatmoko
Keyword(s):  
Surface Water ◽  
Water Resources ◽  
Water Availability ◽  
River Flow ◽  
Rainfall Data ◽  
Rainfall Runoff ◽  
Satellite Technology ◽  
Rainfall Runoff Model ◽  
The Tropics ◽  
Runoff Model

Information on water availability is vital in water resources management. Unfortunately, information on the condition of hydrological data, either river flow data, or rainfall data is very limited temporally and spatially. With the availability of satellite technology, rainfall in the tropics can be monitored and recorded for further analysis. This paper discusses the calculation of surface water availability based on rainfall data from TRMM satellite, and then Wflow, a distributed rainfall-runoff model generates monthly time runoff data from 2003 to 2015 for all river basin areas in Indonesia. It is concluded that the average surface water availability in Indonesia is 88.3 thousand m3/s or equivalent to 2.78 trillion m3/ year. This figure is lower than the study of Water Resources Research Center 2010 based on discharge at the post estimated water that produces 3.9 trillion m3/year, but very close to the study of Aquastat FAO of 2.79 trillion m3 / year. The main benefit of this satellite-based calculation is that at any location in Indonesia, potential surface water can be obtained by multiplying the area of the catchment and the runoff height.

Towards a generic rainfall-runoff model for green roofs

2010 ◽  
Vol 62 (4) ◽  
pp. 898-905 ◽  
Author(s):  
H. Kasmin ◽  
V. R. Stovin ◽  
E. A. Hathway
Keyword(s):  
Green Roofs ◽  
Storm Event ◽  
Rainfall Runoff ◽  
Retention Capacity ◽  
Continuous Simulation ◽  
Moisture Storage ◽  
Substrate Moisture ◽  
Rainfall Runoff Model ◽  
Stormwater Retention ◽  
Runoff Model

A simple conceptual model for green roof hydrological processes is shown to reproduce monitored data, both during a storm event, and over a longer continuous simulation period. The model comprises a substrate moisture storage component and a transient storage component. Storage within the substrate represents the roof's overall stormwater retention capacity (or initial losses). Following a storm event the retention capacity is restored by evapotranspiration (ET). However, standard methods for quantifying ET do not exist. Monthly ET values are identified using four different approaches: analysis of storm event antecedent dry weather period and initial losses data; calibration of the ET parameter in a continuous simulation model; use of the Thornthwaite ET formula; and direct laboratory measurement of evaporation. There appears to be potential to adapt the Thornthwaite ET formula to provide monthly ET estimates from local temperature data. The development of a standardized laboratory test for ET will enable differences resulting from substrate characteristics to be quantified.

scholarly journals Model analysis of forest thinning impacts on the water resources during hydrological drought periods

2021 ◽  
Author(s):  
Hiroki Momiyama ◽  
Tomo'omi Kumagai ◽  
Tomohiro Egusa
Keyword(s):  
Water Resources ◽  
Meteorological Data ◽  
Rainfall Runoff ◽  
Forest Thinning ◽  
Flow Duration ◽  
Mountain Catchment ◽  
Data Generator ◽  
Flow Duration Curves ◽  
Rainfall Runoff Model ◽  
Runoff Model

In Japan, there has recently been an increasing call for forest thinning to conserve water resources from forested mountain catchments in terms of runoff during prolonged drought periods of the year. How their water balance and the resultant runoff are altered by forest thinning is examined using a combination of 8-year hydrological observations, 100-year meteorological data generator output, and a semi-process-based rainfall-runoff model. The rainfall-runoff model is developed based on TOPMODEL assuming that forest thinning has an impact on runoff primarily through an alteration in canopy interception. The main novelty in this analysis is that the availability of the generated 100-year meteorological data allows the investigations of the forest thinning impacts on mountain catchment water resources under the most severer drought conditions. The model is validated against runoff observations conducted at a forested mountain catchment in the Kanto region of Japan for the period 2010–2017. It is demonstrated that the model reproduces temporal variations in runoff and evapotranspiration at inter- and intra-annual time scales, resulting in well reproducing the observed flow duration curves. On the basis of projected flow duration curves for the 100-year, despite the large increase in an annual total runoff with ordinary intensifying thinning, low flow rates, i.e., water resources from the catchment in the drought period in the year, in both normal and drought years were impacted by the forest thinning to a lesser extent. Higher catchment water retention capacity appreciably enhanced the forest thinning effect on increasing available water resources.

scholarly journals Coupling Tank Model and Lars-Weather Generator in Assessments of the Impacts of Climate Change on Water Resources

2019 ◽  
Vol 27 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Naser Mohammadzadeh ◽  
Bahman Jabbarian Amiri ◽  
Leila Eslami Endergoli ◽  
Shirin Karimi
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Weather Generator ◽  
Climate Change Scenarios ◽  
Rainfall Runoff ◽  
The Caspian Sea ◽  
Tank Model ◽  
Rainfall Runoff Model ◽  
The Impact ◽  
Runoff Model

Abstract With the aim of assessing the impact of climate change on surface water resources, a conceptual rainfall-runoff model (the tank model) was coupled with LARS-WG as a weather generator model. The downscaled daily rainfall, temperature, and evaporation from LARS-WG under various IPCC climate change scenarios were used to simulate the runoff through the calibrated Tank model. A catchment (4648 ha) located in the southern basin of the Caspian Sea was chosen for this research study. The results showed that this model has a reasonable predictive capability in simulating minimum and maximum temperatures at a level of 99%, rainfall at a level of 93%, and radiation at a level of 97% under various scenarios in agreement with the observed data. Moreover, the results of the rainfall-runoff model indicated an increase in the flow rate of about 108% under the A1B scenario, 101% under the A2 scenario, and 93% under the B1 scenario over the 30-year time period of the discharge prediction.

scholarly journals Simulation and Optimization of Airport Rainwater Drainage System At Different Control Strategies

2021 ◽  
Author(s):  
Jing Peng ◽  
Lei Yu ◽  
Xiang Zhong ◽  
Tiansong Dong
Keyword(s):  
Flood Control ◽  
Control Strategies ◽  
Water Environment ◽  
Reduction Rate ◽  
Drainage System ◽  
Civil Aviation ◽  
Simulation And Optimization ◽  
Flow Duration ◽  
Impervious Area ◽  
Pump Stations

Abstract The impervious area of the airport is high, which leads to the deterioration of the water environment and frequent waterlogging disasters. The construction of sponge airport has become an important and arduous task in the new era of civil aviation design industry in China. In order to compare the effects of different control strategies at different scenarios, take the airport along China's southeast coast as an example, three scenarios were designed in this study (Scenario 1: no LID facilities and other measures; Scenario 2: two pump stations were setting; Scenario 3: both LID facilities and pump stations). Three simulation models under LID facilities and other measures were developed using SWMM with return period of 5a. The simulation results at different scenarios were compared, the number and the best opening scheme of pumps for each reservoir are finally obtained. The results of Scenario 3 show that the full-flow duration of nodes in the study area is greatly shortened. The decrease of full-flow duration of J1, J2 and J3 was 1.2, 0.8 and 0.5 hours respectively, with reduction rates of 40%, 53.3% and 28.6% respectively. The rainfall peak flows both the first and the second were reduced in this scenario, and the reduction rates were 10.68% and 12.78% respectively. However, the reduction effect of the third peak is poor with the further increase of rainfall intensity. The reduction rate of the total inflow and peak flow of rainwater buckets and permeable pavement is better than that of vegetative swale. The results of this study can provide the reference for the design of sponge airport and the airport flood control management.

scholarly journals Ensemble flood simulation for a small dam catchment in Japan using 10 and 2 km resolution nonhydrostatic model rainfalls

2016 ◽  
Vol 16 (8) ◽  
pp. 1821-1839 ◽  
Author(s):  
Kenichiro Kobayashi ◽  
Shigenori Otsuka ◽  
Kazuo Saito ◽  
Keyword(s):  
Flood Control ◽  
Threshold Value ◽  
Ensemble Member ◽  
Japan Meteorological Agency ◽  
Rainfall Runoff ◽  
Runoff Simulation ◽  
Nonhydrostatic Model ◽  
Discharge Simulation ◽  
Rainfall Runoff Model ◽  
Runoff Model

Abstract. This paper presents a study on short-term ensemble flood forecasting specifically for small dam catchments in Japan. Numerical ensemble simulations of rainfall from the Japan Meteorological Agency nonhydrostatic model (JMA-NHM) are used as the input data to a rainfall–runoff model for predicting river discharge into a dam. The ensemble weather simulations use a conventional 10 km and a high-resolution 2 km spatial resolutions. A distributed rainfall–runoff model is constructed for the Kasahori dam catchment (approx. 70 km2) and applied with the ensemble rainfalls. The results show that the hourly maximum and cumulative catchment-average rainfalls of the 2 km resolution JMA-NHM ensemble simulation are more appropriate than the 10 km resolution rainfalls. All the simulated inflows based on the 2 and 10 km rainfalls become larger than the flood discharge of 140 m3 s−1, a threshold value for flood control. The inflows with the 10 km resolution ensemble rainfall are all considerably smaller than the observations, while at least one simulated discharge out of 11 ensemble members with the 2 km resolution rainfalls reproduces the first peak of the inflow at the Kasahori dam with similar amplitude to observations, although there are spatiotemporal lags between simulation and observation. To take positional lags into account of the ensemble discharge simulation, the rainfall distribution in each ensemble member is shifted so that the catchment-averaged cumulative rainfall of the Kasahori dam maximizes. The runoff simulation with the position-shifted rainfalls shows much better results than the original ensemble discharge simulations.

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