Interactive comment on “ Flood discharge measurement of mountain rivers ” by Y .-C (original) (raw)
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Flood discharge measurement of mountain rivers
Hydrology and Earth System Sciences Discussions
An efficient method that accounts for personal safety, accuracy and reliability for measuring flood discharge of mountain rivers is proposed. It is composed of new measurement method, tools, and techniques. Measuring flood discharge from mountain rivers by using conventional method is costly, time-consuming, and dangerous. Thus previous discharge measurements for mountainous areas were typically based on estimated precipitation, which alone cannot generate accurate measurements. This study applies a novel flood discharge measurement system composed of an Acoustic Doppler Profiler and crane system to accurately and quickly measure velocity distributions and water depths. Moreover a novel and efficient method for measuring discharge, which is based on the relationship between mean and maximum velocities and the relationship between cross-sectional area and gauge height is applied to estimate flood discharge. Flood discharge from mountain rivers can be estimated easily and rapidly by measuring maximum velocity in the river crosssection and the gauge height. The measured flood discharges can be utilized to create a reliable stage-discharge relationship for continuous estimations of discharge using records of water stage. The proposed method was applied to the Nanshih River, Taiwan. Results of measured discharges and estimated discharges only slightly differed from each other, demonstrating the efficiency and accuracy of the proposed method.
Flood discharge measurement of a mountain river – Nanshih River in Taiwan
Hydrology and Earth System Sciences, 2013
An efficient method that accounts for personal safety, accuracy and reliability for measuring flood discharge of mountain rivers is proposed. It is composed of new measurement method, tools, and techniques. Measuring flood discharge from mountain rivers by using conventional method is costly, time-consuming, and dangerous. Thus previous discharge measurements for mountainous areas were typically based on estimated precipitation, which alone cannot generate accurate measurements. This study applies a novel flood discharge measurement system composed of an Acoustic Doppler Profiler and crane system to accurately and quickly measure velocity distributions and water depths. Moreover a novel and efficient method for measuring discharge, which is based on the relationship between mean and maximum velocities and the relationship between cross-sectional area and gauge height is applied to estimate flood discharge. Flood discharge from mountain rivers can be estimated easily and rapidly by measuring maximum velocity in the river crosssection and the gauge height. The measured flood discharges can be utilized to create a reliable stage-discharge relationship for continuous estimations of discharge using records of water stage. The proposed method was applied to the Nanshih River, Taiwan. Results of measured discharges and estimated discharges only slightly differed from each other, demonstrating the efficiency and accuracy of the proposed method.
Hydrological Sciences Journal, 1983
Flow discharge measurements during floods are of considerable importance. These data are very valuable and particularly difficult to obtain. In addition, such measurements are very expensive and often the lives of the people carrying them out are endangered. The paper describes several methods of discharge measurements during floods. It also presents some practical experience with the following types of measurements as variants of the moving boat method: discharge measurements of the whole flood wave using one or two boats employing only the current meter; and the rising floats of different rise speed. Plusieures méthodes de mesure du débit des crues RESUME Les mesures du débit lors des crues sont d'une importance capitale. Ces données sont du plus grand intérêt mais très difficiles à obtenir et les gens qui s'en chargent s'exposent très souvent à des dangers extrêmes. Notre travail traite de plusieurs méthodes de mesure du débit des crues. On expose les principes de fonctionnement et les expériences pratiques concernant les méthodes suivantes: méthode intégrée, mesure de l'hydrogramme complet avec une ou deux embarcations et la méthode de mesure en cas de très fortes crues avec deux flotteurs ayant des vitesses d'émergence différentes.
River discharge changes in the Qinghai-Tibet Plateau
Chinese Science Bulletin, 2006
Annual mean discharge data of the five large rivers in the exorheic region of the Qinghai-Tibet Plateau from 1956 to 2000 are analyzed for trends with the Mann-Kendall nonparametric trend test. The results reveal that though in general no increasing trends exist in the total river discharges, significant regional differences of river discharge exist, reflecting the decreasing trends of discharge
Flood Discharge Analysis Using the SCS Hydrograph Method in the Krung Tripa Watershed
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan
The purpose of this study was to analyze the flood discharge of the krung Tripa river re-period plan and flood behavior based on hydrographic data obtained from rainfall data and estimate the magnitude of peak flood discharge. Flooding is the main problem caused by the overflow of Krung Tripa, with administrative Krung Tripa passes through 2 (two) districts in Aceh Province, namely in Nagan Raya regency in the area of the watershed (DAS) reached 3472.95 Km. Several factors cause flooding, including slope factors and land height of an area, soil type factors land uses. The method used to analyze flood discharge is the Scs Hydrograph method using secondary data. The results of flood discharge analysis obtained flood discharge plans for a 2-year re-period of 2464.033 m3/s, a 5-year re-period of 3597.893 m3/s, in are-period of 10 year obtained the planned flood discharge for a 2-year re-period was 2464.033 033 m3/s, 5-year re-period 3597.893 m3/s, in the 10-year re-period 4372.634 m3/s...
Discharge and sediment measurements at the outlet of a watershed on the Loess plateau of China
Catena, 2003
A dam and weir system was constructed to measure the discharge of water and sediment from a selected small catchment on the Loess plateau in China. The aim of the system described here was to collect data on discharge and sediment content during occasional summer storms. These data can be used for calibrating and validating the LISEM erosion model. A V-notch weir was selected since it can measure a wide range of discharges. The measurement structure was equipped with an ultrasonic sensor to measure the water level. The system automatically switched on as soon as rain had been detected and the water level data were stored when a certain level threshold was surpassed. As a back-up system a flow meter was used, while a local farmer had also been hired to manually record water level during events. Sediment content of the runoff was determined on samples taken by an automatic sampler and a local farmer took additional samples. The system operated from April 1998 until September 2000. In this period, six events occurred and data could be collected during five of those. The data were corrected to make them useful for comparison with erosion simulation results. The collected data show that runoff only occurs during high-intensity rainstorms that produce more than about 11 mm of rain.
The Study of Flood Discharge in Ujong Krueng in the Tripa Watershed
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan
The Krueng Tripa River is located Nagan Raya Regency that is vunerability to flooding. Administratively Krueng Tripa flows through two regencies in Aceh Province, namely Gayo Lues Regency in the upper reaches of the river and Nagan Raya Regency in its downstream with an area of watershed covering 2953,457 km². The rainfall in this watershed is around 2,197 mm per year. High rainfall has a major impact on flood disasters and has a negative impact on the surrounding community.The purpose and benefits of this study are to determine the magnitude of the flood discharge of the Krueng Tripa River and as input for related darta in flood mitigation problems. Analysis of the flood discharge using the Synthesis Unit Hydrograph (HSS) Gama I method. From the analysis using the distribution of log person III with return periods of 2, 5, 10, 25, 50, and 100 years, it were obtained respectively 141,520 mm, 192,349 mm; 227.094 mm; 272.270 mm; 306,569 mm; 341,869 mm. The results of the flood analysi...
2021
This paper aims to analyse the flood discharge based on the Synthetic Unit Hydrograph (SUH), using the Soil Conservation Service method (SCS), the SUH of Nakayasu method, and the SUH of Gama I method. Modelling formed the basis of the research conducted on the Bengawan Solo River, Indonesia. The embankment construction on the Dengkeng–Pusur Section was designed as a method of flood control in 1988. The problem was that around its location are densely populated cities, industrial areas, and agricultural areas. In order to measure the risk of embankment failure and water structure planning in general, it is necessary to analyse the maximum flood discharge. There are several methods for analysing maximum flood discharge, so finding a suitable method is essential due to the lack of measuring tools to calculate flood discharge in some areas. The calculation is compared with the observation data at the Serenan AWLR station, which is in the Dengkeng–Pusur section. The observation rainfall ...