Filters: Tags: Flow duration (X)
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A generalized least squares (GLS) technique was used with atsite nday lowflow time series and frequencies, from SWToolbox (Kiang and others, 2018), and 14 basin characteristics (basin perimeter, drainage area, maximum basin elevation, mean total annual reference evapotranspiration, groundwater head, length of longest flow path, minimum basin elevation, runoffcurve number, relief, ruggedness, slope ratio, percentage of hydrologic soil type B, available water capacity, and total length of streams in a basin) for 28 selected streamflow gaging stations in Puerto Rico to calculate regional nday lowflow frequency regression equations for ungaged stream locations. The GLS approach assigns weights based on uncertainty...
The intense demand for river water in arid regions is resulting in widespread changes in riparian vegetation. We present a direct gradient method to predict the vegetation change resulting from a proposed upstream dam or diversion. Our method begins with the definition of vegetative cover types, based on a census of the existing vegetation in a set of 1 x 2 m plots. A hydraulic model determines the discharge necessary to inundate each plot. We use the hydrologic record, as defined by a flow duration curve, to determine the inundation duration for each plot. This allows us to position cover types along a gradient of inundation duration. A change in river management results in a new flow duration curve, which is used...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Ecological Applications,
Environmental impacts,
bottomland vegetation,
dam,
discharge,
An ordinary least squares (OLS) technique was used with atsite flowduration exceedance probabilities, from SWToolbox (Kiang and others, 2018), and 14 basin characteristics (basin perimeter, drainage area, maximum basin elevation, mean total annual reference evapotranspiration, groundwater head, length of longest flow path, minimum basin elevation, runoffcurve number, relief, ruggedness, slope ratio, percentage of hydrologic soil type B, available water capacity, and total length of streams in a basin) for 28 selected streamflow gaging stations in Puerto Rico to calculate regional flowduration regression equations for ungaged stream locations. The final flowduration regression equations were developed in R (R...
Flowduration statistics at the 99th, 98th, 95th, 90th, 80th, 70th, 60th, and 50th percent exceedance probabilities and annual nday lowflow statistics for the 1, 7, 14, and 30day mean low flows with 2year (0.5 nonexceedance probability), 5year (0.2 nonexceedance probability), and 10year (0.1 nonexceedance probability) recurrence intervals were computed for 28 selected streamflow gaging stations in Puerto Rico. The 28 selected streamflow gaging stations were required to have 10 or more years of daily mean streamflow data through water year 2018. The flowduration statistics and nday lowflow frequencies were computed using the U.S. Geological Survey program, SWToolbox. Regional regression equations were...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Hydrology,
Puerto Rico,
Puerto Rico,
USGS Science Data Catalog (SDC),
daily mean streamflow,

