Subj : Wx Terms (D)(3)
To : All
From : Daryl Stout
Date : Thu Oct 05 2017 12:06 am
Discharge
In hydrologic terms, the rate at which water passes a given point.
Discharge is expressed in a volume per time with units of L3/T.
Discharge is often used interchangeably with streamflow.
Discharge Curve
In hydrologic terms, a curve that expresses the relation between the
discharge of a stream or open conduit at a given location and the stage
or elevation of the liquid surface at or near that location. Also called
Rating Curve and Discharge Rating Curve.
Discharge Table
In hydrologic terms,
1. A table showing the relation between two mutually dependant quantities
or variable over a given range of magnitude.
2. A table showing the relation between the gage height and the discharge
of a stream or conduit at a given gaging station. Also called a Rating
Table.
Disdrometer
Equipment that measures and records the size distribution of raindrops.
Disk
The visible surface of the sun (or any heavenly body) projected against
the sky.
Dispersion
The process of separating radiation into various wavelengths.
Distribution (Hydro)Graph
In hydrologic terms, a unit hydrograph of direct runoff modified to show
the proportions of the volume of runoff that occur during successive
equal units of time.
Diurnal
Daily; related to actions which are completed in the course of a calendar
day, and which typically recur every calendar day (e.g., diurnal
temperature rises during the day, and diurnal falls at night).
Diurnal Cycles
Variations in meteorological parameters such as temperature and relative
humidity over the course of a day which result from the rotation of the
Earth about its axis and the resultant change in incoming and outgoing
radiation.
Diurnal Temperature Range
The temperature difference between the minimum at night (low) and the
maximum during the day (high).
Divergence
The expansion or spreading out of a vector field; usually said of
horizontal winds. It is the opposite of convergence. Divergence at upper
levels of the atmosphere enhances upward motion, and hence the potential
for thunderstorm development (if other factors also are favorable).
Diversion
In hydrologic terms, the taking of water from a stream or other body of
water into a canal, pipe, or other conduit.
Divide
In hydrologic terms, the high ground that forms the boundary of a
watershed. A divide is also called a ridge.
Dividing Streamline
In the blocked flow region upwind of a mountain barrier, the streamline
that separates the blocked flow region near the ground from the
streamlines above which go over the barrier.
Dividing Streamline Height
The height above ground of the dividing streamline, as measured far
upwind of a mountain barrier. See dividing streamline.
DMNT
Dominant
DMSH
Diminish
DNR
Department of Natural Resources
DNS
Dense
DNSTRM
Downstream
Dobson Unit
Unit used to measure the abundance of ozone in the atmosphere. One Dobson
unit is the equivalent of 2.69/ x 1016 molecules of ozone/cm2.
DOC
Department of Commerce
DOH
Development and Operations Hydrologist
Doldrums
The regions on either side of the equator where air pressure is low and
winds are light.
Domain
In air pollution modeling, the geographical area over which a simulation
is performed.
Domestic Consumption
In hydrologic terms, the quantity, or quantity per capita, of water
consumed in a municipality or district for domestic uses or purposes
during a given period, generally one day. It is usually taken to include
all uses included within the term Municipal Use of Water and quantity
wasted, lost, or otherwise unaccounted for.
Domestic Use of water
In hydrologic terms, the use of water primarily for household purposes,
the watering of livestock, the irrigation of gardens, lawns, shrubbery,
etc., surrounding a house or domicile.
Doppler Radar
Radar that can measure radial velocity, the instantaneous component of
motion parallel to the radar beam (i.e., toward or away from the radar
antenna).
Down-Valley Wind
A thermally driven wind directed down a valley's axis, usually occurring
during nighttime; part of the along-valley wind system.
Downburst
A strong downdraft current of air from a cumulonimbus cloud, often
associated with intense thunderstorms. Downdrafts may produce damaging
winds at the surface.
Downdraft
(Abbrev. DWNDFT) - A small-scale column of air that rapidly sinks toward
the ground, usually accompanied by precipitation as in a shower or
thunderstorm. A downburst is the result of a strong downdraft.
Downslope Flow
A thermally driven wind directed down a mountain slope and usually
occurring at night; part of the along-slope wind system.
Downstream
In the same direction as a stream or other flow, or toward the direction
in which the flow is moving.
Downstream Slope
In hydrologic terms, the slope or face of the dam away from the
reservoir water. This slope requires some kind of protection
(e.g.; grass) from the erosive effects of rain and surface flow.
Downwash
A deflection of air downward relative to an object that causes the
deflection.
Downwelling Radiation
The component of radiation directed toward the earth's surface from
the sun or the atmosphere, opposite of upwelling radiation.
DP
1. Deep
2. Dew Point
DPD
On a buoy report, dominant wave period (seconds) is the period with the
maximum wave energy.
DPNG
Deepening
DPTH
Depth
DPTR
Departure
DR
Direction
Drainage Area
In hydrologic terms, an area having a common outlet for its surface
runoff (also see Watershed and Catchment Area).
Drainage Basin
In hydrologic terms, a part of the surface of the earth that is occupied
by a drainage system, which consists of a surface stream or a body of
impounded surface water together with all tributary surface streams and
bodies of impounded surface water.
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