Showing results for: hydrologic monitoring Articles
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Urban Groundwater Resources Management in Arizona - Case Study
Motivation The Sonoran Desert cities of Phoenix and Tucson face long-term challenges for maintaining sustainable water supplies for existing populations and anticipated future growth. Phoenix and Tucson rely on groundwater to meet a significant portion of their water needs, and both cities are expanding their aquifer storage and recovery operations. Optimized management of these critical (in same ...
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Comparing classical performance measures with signature indices derived from flow duration curves to assess model structures as tools for catchment classification
The ability of a hydrological model to reproduce observed streamflow can be represented by a large variety of performance measures. Although these metrics may suit different purposes, it is unclear which of them is most appropriate for a given application. Our objective is to investigate various performance measures to assess model structures as tools for catchment classification. For this ...
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Combined interpretation of radar, hydraulic, and tracer data from a fractured-rock aquifer near Mirror Lake, New Hampshire, USA
An integrated interpretation of field experimental cross-hole radar, tracer, and hydraulic data demonstrates the value of combining time-lapse geophysical monitoring with conventional hydrologic measurements for improved characterization of a fractured-rock aquifer. Time-lapse difference-attenuation radar tomography was conducted during saline tracer experiments at the US Geological Survey ...
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Pesticide transport with runoff from turf: observations compared with TurfPQ model simulations
Received for publication September 30, 2008. Pesticides applied to turf grass have been detected in surface waters raising concerns of their effect on water quality and interest in their source, hydrological transport and use of models to predict transport. TurfPQ, a pesticide runoff model for turf grass, predicts pesticide transport but has not been rigorously validated for larger storms. The ...
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A Brief History of Stevens' 116 Year Chart Recorder Legacy
The legendary mechanical chart recorder for environmental monitoring dates back to 1911, when John C. Stevens invented the Type A chart recorder. In 1906, J.C. Stevens was the Hydrographer for the USGS out of Portland, Oregon, and was soon promoted to District Engineer. While with the USGS, he realized that hiring local citizens to observe and record height of water was not accurate or reliable. ...
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Weather SDM: estimating snow density with high precision using snow depth and local climate
Snow density is an important measure in hydrology used to convert snow depth to the snow water equivalent (SWE). A model developed by Sturm, Tara and Liston predicts the snow density by using snow depth, the snow age and a snow class defined by the location. In this work this model is extended to include location and seasonal weather-specific variables. The model is named Weather Snow Density ...
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A comparison of single- and multi-gauge based calibrations for hydrological modeling of the Upper Daning River Watershed in China's Three Gorges Reservoir Region
Many parameters in hydrological models cannot be measured directly and should be estimated through calibration. In this study, four separate calibration schemes, including a multi-gauge and three single-gauge ones, were conducted to simulate the daily stream flow of the Upper Daning River in China's Three Gorges Reservoir Region using the Soil and Water Assessment Tool (SWAT). A highly ...
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An exciting and eventful year is drawing to a close
Best wishes for the holiday season We would like to thank our customers, suppliers and partners for their confidence in our products and your loyalty in 2018. We send everyone best wishes for the holiday season and wish a Happy and Healthy New Year. Our review 2018 A lot has happened at OTT this year: With the integration of the sensor technology manufacturer Kipp & Zonen, the OTT ...
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Lake water levels for calibration of the S-HYPE model
Lake water levels are easy to measure, and can be seen as a transformation of discharge. Water level measurements from 42 lakes in Sweden were analysed, and eight of these lakes were modelled using the Swedish S-HYPE model. The objective was to test if a hydrological model can be calibrated using water level data instead of discharge. A semi-analytical lake routing was developed to resolve ...
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Water & Rivers Commission
The Water and Rivers Commission manages the water resources of Western Australia with an area of about 2.5 million square kilometres. The Information and Systems Group in the Hydrologic Measurement Support Section at the Water and Rivers Commission maintains data archives SWRIS (State Water Resources Information System) and Hydstra. SWRIS is used predominantly for the storage of water quality ...
By KISTERS
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Helios Field-portable Core & Soil Analyzer Uses Advanced NMR for Sample Analysis
Vista Clara’s Helios Core and Soil Analyzer (formerly named Corona) brings an unprecedented level of accuracy, flexibility and portability for robust measurements of hydrologic properties across a wide range of core sizes and lithology. By combining advanced NMR technology with low-field, high-bandwidth operation, Helios delivers laboratory precision in a field portable lightweight rugged ...
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Live Webinar: OTT SVR 100 Radar Sensor - contact-free reliable and maintenance-free measurements
The measurement of the velocity at the water surface is one of the oldest hydrometric measuring methods, time-tested and easy to carry out with the aid of surface floats. While float measurements are only temporarily applicable and often error-prone, modern radar sensors can determine the surface velocity in real time and with a very high measuring accuracy around the clock. Learn more about ...
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The climate of the future has been analyzed in 13 counties
Over the past two years, around two-thirds of the local County Administrations in Sweden have entrusted SMHI to construct plausible scenarios of future climate development in the relevant counties. Based on observations and analyses from the SMHI as well as climate scenarios from international climate research, the assignments have been prepared in close dialogue with the County Administrations ...
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Integrated actions in the management of critical hydrologic events
Owing to the increase in urban populations, there has also been an increased incidence of critical events, especially those related to floods and landslides. Since the implementation of the National Civil Defense System in Brazil, a focus on disaster management is no longer the answer when assisting those affected; instead, the answer has become managing disaster risk, in addition to the ...
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An evaluation of hydrometric monitoring across the Canadian pan-Arctic region, 1950–2008
This study evaluates the hydrometric monitoring maintained within the Canadian pan-Arctic and is based on the hydrometric gauges closest to northern seas for 76 river systems throughout 1950–2008. Monitoring is quantified by compiling time series of total gauged area and discharge values from the available hydrometric records. We further evaluate the quality of hydrometric data by examining the ...
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The search for orthogonal hydrological modelling metrics: a case study of 20 monitoring stations in Colombia
This paper presents a Colombian-based study on hydrological modelling metrics, arguing that redundancies and overlap in statistical assessment can be resolved using principal component analysis. Numerous statistical scores for optimal operator water level models developed at 20 hydrological monitoring stations, producing daily, weekly and ten-day forecasts, are first reduced to a set of five ...
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Online discharge measurement with OTT SLD
Background For the economic management of the waterways between Elbe and Oder it is essential to know the discharge of these rivers at defined locks. The authority for water and navigation (WSA) in Lauenburg operates hydrological stations for the measurement of water level and discharge to effectively regulate the water flow at the locks in Plau and Malliß (Mueritz-Elde-waterway) and in ...
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A new hybrid drought-monitoring framework based on nonparametric standardized indicators
A drought is a multi-dimensional event characterized by changes in the atmospheric and land conditions. Hence, monitoring a single drought indicator may be insufficient for water management. The hybrid drought index (HDI) is presented as a nonparametric composite indicator for monitoring multiple components of the hydrologic cycle. The properties of the HDI can be summarized as follows: (1) ...
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SL20 USV Conducts Topographic Survey To A River Section - Case Study
Date: April 16, 2019 Location: A River Section Near Youyi Bridge in Xiangyang City, Wuhan Facility: SL20 Autonomous Survey USV River condition: Relatively strong wind, waves over 10cm high, with ships passing by. Mission: Utilize the SL20 USV to survey the underwater topography and section of this river sector systematically to generate a three-dimensional coordinate system for later ...
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Optimal sampling network for monitoring the representative water quality of an entire reservoir on the basis of information theory
This study presents a method for optimal selection of sampling stations for representative and effective water quality monitoring of a reservoir on the basis of information theory. We adopt an objective function used for the design of other hydrological monitoring networks such as rain gauge networks. Unlike rain gauges, in which only a single variable of rainfall is of interest, water quality ...
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