This is an introductory book on hydrology and written for undergraduate students in civil and environmental engineering, environmental science and geography. Hydraulic analysis and double mass curves of the middle rio. Module context while designing a training course, the relationship between this module and the others. Lucc and its impact on runoff yield in the bai river. The double mass curve dmc is often adopted for the trend analysis for its low data requirement and high transferability. Double mass analysis is a commonly used data analysis approach for investigating the behaviour of records made of hydrological or meteorological data at a number of locations. The double mass analysis is used to detect if data at a site have been subjected to a significant change in magnitude due to external factors such as problems with instrumentation, observation practices, or recording conditions. Homogeneity and trend analysis of hydrometeorological data of. Double mass analysis units are acresfeet unless otherwise noted trinidad gage.
A double mass curve is a graph of the cumulative catch at the rain gage of interest versus the cumulative catch of one or more gages in the regions that have been subjected to similar hydro meteorological occurrences and are known to be. The resulting flow records were tested by doublemass analysis with. Doublemasscurve analysis is the method that is used to. Double mass curve is a simple, visual and practical method, and it is widely used in the study of the consistency and longterm trend test of hydrometeo rological data mu, et al. This method was first used to analyze the consistency of. The double mass curve is used to check the consistency of many kinds of hydrologic. Double mass curve analysis is the method that is used to. Request pdf on oct 1, 2017, peng gao and others published use of. Hydrology is a branch of scientific and engineering discipline that. The mass balance for the pond can be written in the following form.
The course folder must be submitted on specified dates to be announced in the class. A practitioner of hydrology is called a hydrologist. Topic 234 precipitation data analysis missing rainfall data point precipitation arithmetic mean method. Calculated baseflow and runoff volumes using the what tool for the luverne gage. The double mass curve is a wellknown simple tool for checking and adjusting inconsistencies in hydrometeorological data caused by changes in observation methods or data processing. May 02, 2019 calculates the double mass curve of two object of class lfobj. The consistency of a rainfall record is tested with double mass analysis. It is used to determine whether there is a need for corrections to the data to account for changes in data collection procedures or other local conditions. It was thought that the land mass floated on a body of water, and the water in rivers and. The graphical application of the doublemass analysis is done by plotting all coordinate points x i and y i. Oct 12, 2010 nust institute of civil engineeringengr sajjad ahmad1.
Catchment hydrology and calibration in this section, an analysis is made of the rainfall and streamflow data so far collected from the experimental area, with a view to establishing the precision of calibration relationships for water. Request pdf on oct 1, 2017, peng gao and others published use of double mass curves in hydrologic benefit evaluations find, read and cite all the research you need on researchgate. A double mass analysis dma was also conducted on the albuquerque reach. General surfacewater techniques, with a section fitting curves to cyclic data searcy, james on. Many of the precipitation and stream gaging stations used for analysis in the study area do not have a longterm record, a continuous record, or both. River flow is the only component of the hydrological cycle which can be measured. Changes in the location or exposure of a rain gage may have a significant effect on the amount of precipitation it measures, leading to inconsistent data data of different nature within the same record. This method was first used to analyze the consistency of precipitation data in susquehanna watershed united states by. The theory of double mass curve is based on a graph of accumulation of one quantity against the accumulation of.
Hydorlogic statistics and frequency analysis are given in chapter 11. Bee 473 watershed engineering fall 2007 october 17, 2008. Homogeneity and trend analysis of hydrometeorological. The time series analysis was used to show the seasonal and interannual trends on river discharge, sediment yield and total. General surfacewater techniques, with a section fitting curves to cyclic data. Double mass curves dmcs, being one useful method for comparative analyses, are characterized by low data requirements and high transferability, and thus more practical than water balance equations and hydrological models for hydrologic benefit evaluations. Use of double mass curves in hydrologic benefit evaluations. It is related to geological type of reseach double mass analysis 1 is a commonly used data analysis approach for investigating the behaviour of records made of hydrological. The double mass curve technique is also useful in checking arithmetical errors in transferring rainfall data from one record to another.
The relative linearity of the figure shows that the data for the nipomo 2nw station are consistent. It is a plot of accumulated precipitation against time, plotted in chronological order. Mass curve plot of accumulated rainfall against time time cumulative time cumulative rainfall 46 0 0 68 2 4 810 4 12 1012 6 24 1214 8 34 1416 10 42. Part 1, general surface water techniques doublemass curves by james k. The consistency of a rainfall record is tested with doublemass analysis.
The use of a doublemass curve as described in this manual is a convenient way to. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Double mass curve analysis for the rock river gage at luverne. Both the linear regression and double mass curve analysis belong to. The trend and slope of dmc are the focus of general concern. Hydrology is the science that treats the waters of the earth, their. An analysis of watershed hydrological double mass curve based on elasticity index. Streamflow measurement and hydrographs are discussed in chapter five hydrology of small and mid size watersheds are discussed in chapter six and seven respectively.
Hydrognomon is free software for time series analysis but it is unsupported. Module context while designing a training course, the relationship between this module and the others, would be maintained by keeping them close together in the syllabus and place them in a logical sequence. The residual mass, curve which is a modification of the doublemass curve, magnifies imperceptible breaks in the doublemass curve for detailed study. Part 2, lowflow tecfotques streams, a flow year of a few months length might be a more prac tical basis for flowduration curves than a 12month year. Double mass curve is a simple, visual and practical method, and it is widely used in the study of the consistency and longterm trend test of hydrometeo. Jun 21, 20 hydrology, double mass analysis khalil khello. An analysis of watershed hydrological double mass curve based. Frequency analysis is done to obtain relation between magnitude of events and probability. Quite often data sets containing a weather variable y i observed at a given station are incomplete due to short interruptions in observations. A doublemass curve is a graph of the cumulative catch at the rain gage of interest versus the cumulative catch of one or more gages in the regions that have been subjected to similar hydro meteorological occurrences and. Theory of double mass curves and its applications in. The residualmass, curve which is a modification of the doublemass curve, magnifies imperceptible breaks in the doublemass curve for detailed study.
Nov 30, 2016 from wikipedea, the following is the answer,which can easily you find it. Doublemass analysis of point precipitation the doublemass analysis is used to detect if data at a site have been subjected to a significant change in magnitude due to external factors such as problems with instrumentation, observation practices, or recording conditions. Mu and others published theory of double mass curves and its applications in hydrology and meteorology find, read and cite all the research you need on. Part 1, general surface water techniques double mass curves by james k. Double mass curve analysis for the rock river gage at hardwick. Double mass curve a double mass curve is an analysis based on a cumulative comparison of an independent and dependent variable.
Nust institute of civil engineeringengr sajjad ahmad1. The double mass curve dmc is often adopted for the trend analysis for its low data. The method of double mass curve dmc is often used in the analysis of the consistency of hydrometeorological factors and their interannual variations. The study on sabo and flood control for western river basins of mount pinatubo in the republic of the philippines final report supporting report. The aim of this book is to provide a concise coverage of key contents in hydrology that is easy to access through the internet. Hardison abstract the double mass curve is used to check the consistency of many kinds of jiydrologic data by comparing data. The residual mass, curve which is a modification of the double mass curve, magnifies imperceptible breaks in the double mass curve for detailed study. Double mass analysis is a commonly used data analysis approach for investigating the behaviour of records made of hydrological or meteorological data at a.
From wikipedea, the following is the answer,which can easily you find it. An analysis of watershed hydrological double mass curve. Results from double mass analysis comparing a cpcp polygon and an observation station within the polygon in the comahue region. All tutorial sheets question papers and answer sheets, assignments and test papers shall be placed in a course folder. Hydrology is the science that treats the waters of the earth, their occurrence, circulation and distribution, their chemical and physical. Double mass analysis of point precipitation the double mass analysis is used to detect if data at a site have been subjected to a significant change in magnitude due to external factors such as problems with instrumentation, observation practices, or recording conditions. Calculation of low flow statistics for daily stream flow data rdrr. Design hydrology and sedimentation for small catchments. The method is adaptable to hydrologic series with multiple inconsistencies.
A double mass curve is a graph of the cumulative catch at the rain gage of interest versus the cumulative catch of one or more gages in the regions that have been subjected to similar hydro meteorological occurrences and are known to be consistent if a double mass curve has a constant slope, the record is consistent. Calculates the double mass curve of two object of class lfobj. By taking the dmc of annual precipitationrunoff in a watershed as an example, this paper analyzed the characteristics of. Of the several methods of fitting a smooth curve to cyclic or periodic data, the movingare method and the double integration method deserve greater, use in hydrology. Of the several methods of fitting a smooth curve to cyclic or periodic data, the movingare method and the doubleintegration method deserve greater, use. Figure 10 shows the results of double mass analysis for the average of the stations at california state polytechnic university and santa maria versus the nipomo 2nw station. Presentation on river routing and reservoir routing are given in chapter eight and nine respectively. This is useful in hydrologic data as it allows the examination of the relationship between two variables.