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Topic: Distributary


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In the News (Sun 26 May 19)

  
  Distributary - Wikipedia, the free encyclopedia
The opposite of a distributary is a tributary.
Distributaries usually occur as a stream nears a lake or the ocean, but they can occur inland as well, such as in an endorheic basin, or when a tributary stream bifurcates as it nears its confluence with a larger stream.
The IJssel, the Waal and the Nederrijn (Lower Rhine) are the three principal distributaries of the Rhine.
en.wikipedia.org /wiki/Distributary   (369 words)

  
 HA 730-F Mississippi embayment aquifer system text
Distributary channels are effectively isolated by the weight of sandy channel sediment, which causes compactional subsidence.
Distributary deposits are in the middle Claiborne aquifer as elongate bodies separated by areas almost devoid of sand that represent interdistributary deposits (fig.
Distributary channels of the middle Claiborne aquifer area characterized by high concentrations of sand (50 percent or greater) that extend as narrow, slightly meandering, elongate sand bodies (fig.
capp.water.usgs.gov /gwa/ch_f/F-text4.html   (3358 words)

  
 Utah Geological Survey
Distributary channel switching is the implied mechanism for clinoform cyclicity in Figure 3.
The distributary complex facies is characterized by a predominance of sandstone and trough-cross stratification which is typically unidirectional.
From a distance, this facies is often characterized by the complex geometry of bedsets and large-scale bounding surfaces in contrast to the flat to very gently inclined surfaces of the lower delta-front.
geology.utah.gov /emp/ferron/ferr16qu.htm   (2611 words)

  
 Danube   (Site not responding. Last check: 2007-10-13)
The major distributaries of the Danube consist of three major channels, the St. George to the south, the Sulina in the middle, and the Kilia to the north (Almazov et al., 1963) [06-i01].
The Kilia distributary to the north is the youngest part of the delta.
Once the Kilia distributary became the dominant channel, wave reworking of the older distributaries resulted in the formation of transgressive beaches at these river mouths.
www.geol.lsu.edu /WDD/EUROPEAN/Danube/danube.htm   (1460 words)

  
 Agreement concerning the loan of waters of the Colorado River
The said distributaries and the said water-course heads taking out of the Butana distributary shall be constructed at the cost of the British Government, but when completed shall be handed over to the Jind State, with the exception of the masonry heads and the portions of the channels within canal limits.
Gauges shall be placed at the hand of each distributary for the determination of full supplies, the zero of the gauge in each case being placed on the level of the bed of the distributary.
I distributary having been constructed to carry double the full supply sufficient for the irrigation of the area dependent on it shall be closed at the head during every alternative week or other convenient interval of time and shall be opened in the corresponding alternative intervals.
www.internationalwaterlaw.org /RegionalDocs/Jumna-Canal-India.htm   (911 words)

  
 Lower Delta Plain
It is typically a brackish to saline environment and is the scene of more active deposition, mostly by crevassing or overbanking from the deltaic distributaries, modified by the input of marine sediments from storms.
Distributaries are small, shifting channels that carry water away from the main river channel and distribute it over the surface of the delta.
The depth of the channel decreases rapidly as the river mouth bar is approached and water depth over most distributary mouth bars, that occur when the coarsest material is deposited at the mouth of the distributary, rarely exceeds 3 m.
strata.geol.sc.edu /MARINESEDIMENTS/delta/lower_delta.htm   (1003 words)

  
 HA 730-F Coastal lowlands aquifer system text
Lobate and elongate distributaries have sand deposits in the distributary channels and as arcuate accumulations at the delta front, where the sand settles out of suspension when the river water confined in the distributary loses velocity as it enters deeper water (fig.
The delta-plain facies parallel elongate distributary channels and are more complex than the facies of a lobate delta but show a banded pattern of sediment that is progressively finer with increasing distance from the distributary channel.
In both types of distributaries, the axis of maximum sand thickness is located at the distributary channel.
capp.water.usgs.gov /gwa/ch_f/F-text3.html   (4263 words)

  
 WDN Literature References: River Deltas and Sea Level Rise
The evolution of distributary channels and related river-mouth sand bars was an important process of delta migration or progradation.
A buried distributary channel system that delivered sediment to the currently inactive southern front of the Fraser River delta during the mid Holocene is described from 32 vibracores and 403 core logs.
Moreover, the distributaries and their distal underwater channels underwent erosion by the river flow at least until the end of the last century.
cires.colorado.edu /science/groups/wessman/projects/wdn/refs/seaLevel.html   (16283 words)

  
 USGS Seafloor Mapping Cruise Report: F-90-3 and F-90-4
The distributary channel could only be traced to within about 5 km of the main channel, and a mottled area separates the two channels.
Mass wasting seemed to be common on the flanks of the levees of the main channel, and we think that the complicated transition from the main channel to the distributary channel was due to this area being masked by mass wasting deposits.
The distributary channel was followed eastward to the second survey area which was at the distal end of this channel system and covered an area of approximately 2200 km2.
pubs.usgs.gov /of/2000/of00-352/htmldocs/crpt/index.htm   (918 words)

  
 Intervention analysis of an irrigation system using a structured system concept
Typically, in each distributary three villages were selected, one each in the head, middle and tail reaches; the selection of five farmers in each village was based on village records and distributed between small and large farmers.
The figure indicates that equity is not a major problem in the head and middle reaches while it is one in the tail-end distributaries, where 23 percent of the farmers in kharif and 61 percent in rabi reported "not fair" at present.
Farmer participation both in decision-making at scheme level and in operation and maintenance at the distributary level needs to be given the pre-eminent role, and detailed guidelines and mechanisms need to be put in position in the early stages of implementation itself.
www.fao.org /docrep/003/x6626e/x6626e07.htm   (7854 words)

  
 (TV-15) Sediment Trapping at “The Jaws” - General Factsheet
Distributary channels will be dredged to deliver water and sediment to the project area.
One way to trap sediments is to build both vegetated terraces to dissipate wave energy and distributary channels to direct sediments to the project area.
Dredge spoil will be used to create low elevation terraces along the landward flank of each dredged distributary to protect the depositional area associated with the channel landward of the terrace.
www.lacoast.gov /reports/display.asp?projectNumber=TV-15&reportType=general   (308 words)

  
 ADB Project in Pakistan Gives Farmers More Control Over Irrigation - ADB.org
Procedures and institutional arrangements for participatory management of distributary canals will be developed in a pilot area in preparation for wider replication, and will ultimately lead to reduced fiscal demand.
Improvement of the distributary canals and watercourses will be planned and implemented with full involvement of the concerned communities.
In the case of the distributary canal improvements and office conversion, the civil works contracts identified are less than US$0.5 million and will be awarded on the basis of local competitive bidding among prequalified local contractors following Government procedures acceptable to the Bank.
www.adb.org /Documents/News/1999/pi1999017.asp   (370 words)

  
 COALBED METHANE: LOUISIANA'S UNDEREXPLOITED ENERGY RESOURCE; John B. Echols; Search and Discovery Article #10011 (2000)
The prograding distributary mouth bar sequence is the initial facies of the construction phase of delta building.
The distributary mouth bar is formed as the distributary channel enters the receiving basin and drops its sedimentary load at the mouth and flanks of the channel in the quieter waters of the basin, ultimately building to substantial thickness and forming the distributary mouth bar sand.
The interval from 3050 feet to the top of the distributary mouth bar (approximately 3580 ft) is composed of distributary channel sands and interdistributary bayfill beds and coals.
www.searchanddiscovery.com /documents/Echols2/index.htm   (2770 words)

  
 ADB Project in Pakistan Gives Farmers More Control Over Irrigation - ADB.org
Farmers' organizations for the first time will have management control of the distributary canals that feed the smaller watercourses which irrigate their individual farms.
The physical condition of the distributary canals across Pakistan has deteriorated due to lack of maintenance, resulting in significant inequalities in delivery, frequent breaches of the canals, and water loss due to seepage.
Two of the larger distributary canal commands in the Punjab covering a total of 53,000 hectares will be covered by the project.
www.adb.org /Documents/News/1999/nr1999017.asp   (486 words)

  
 Spectrum 2000
The blue patterns, which result from foreset bed deposition, dip in the direction of current flow (to the east-southeast) and the red patterns, which result from drape over the base of the channel, dip toward the scour channel axis (east-southeast).
The overlying yellow pattern could have a few causes, but is most likely a reworked distributary channel or mouth bar sands, since it is sandwiched between channel deposits.
In general, blue patterns dipping away from the channel axis indicate crevasse splays; blue patterns dipping parallel to channel strike are due to a distributary mouth bar.
www.spec2000.net /text134fp/Appendix3401Gilreath.htm   (1858 words)

  
 GEO_PLATE_D-2.HTML   (Site not responding. Last check: 2007-10-13)
The major distributaries of the Danube (F) consist of three major channels, the St. George to the south, the Sulina in the middle, and the Kilia to the north (Almazov et al., 1963).
The distributary channels are bordered by well-developed natural levees that are quite narrow, generally less than 250 m wide.
Offshore of these young prograding distributaries, slope is extremely low, the coastline is very muddy, and beaches are entirely absent.
disc.gsfc.nasa.gov /geomorphology/GEO_5/GEO_PLATE_D-2.HTML   (841 words)

  
 GIS based diagnostic analysis of irrigation system performance assessment of Bhadra command area at disaggregated level
The 15 distributary is in a very poor condition with the entire portion of the channel being weeded and with lot of physical damages to the system.
The map base is prepared by scanning the topo maps and the available revenue survey maps of the three distributaries and are reduced to a scale of 1:16000 to 1:8000 and are digitized edited and corrected with respect to topo maps.
Spatial variability of the yield at different reaches of the distributaries were studied to locate the low yielding pockets and further analysis with respect to gap in structural and logistical components.
gisdevelopment.net /application/agriculture/irrigation/agriir002pf.htm   (3707 words)

  
 Identifying the morphological changes of a Distributary of the ganges in response to the Declining flow using remote ...
After the avulsion of the Jamuna River from its course along the eastern side of the Pleistocene Madhupur tracts to its present course, the combined flow of the Jamuna and Ganges moved further in the southeast direction and followed the present course as Lower Meghna (Figure 1).
The Gorai River is the largest distributary of the Ganges River in Bangladesh.
However, due to the reduced dry season flow and the quicker recession of floodwater in the Ganges in the post-Farakka period, dry season flow through the Gorai was affected significantly.
www.gisdevelopment.net /aars/acrs/1999/ts2/ts2039pf.htm   (2780 words)

  
 GEO_PLATE_D-9.HTML   (Site not responding. Last check: 2007-10-13)
Near the distributary mouths, the channels bifurcate to form numerous small channels (E) that prograde out onto the delta front that previously served as the subice platform or the shorefast ice zone.
The delta plain is fringed by prograding tidal flats and slightly coarser zones associated with the distributary mouth bars.
The active distributaries display relatively high sinuosity, and channel migration is rather common as a result of the abundant coarse material in the delta plain.
daac.gsfc.nasa.gov /geomorphology/GEO_5/GEO_PLATE_D-9.HTML   (723 words)

  
 Participatory action research to improve irrigation operations: Examples from Indonesia and India
The second case involves the creation of a farmers' distributary canal committee and the introduction of new operational procedures for enhancing equity and management control in the Paliganj Distributary Canal of the Sone Command in Bihar, India.
A meeting of leading farmers from villages in the lower reaches of the Paliganj Distributary was organized by the ARP team on 17 March 1989.
Farmers felt that this was the level at which most of the problem with water distribution occurred and that until this was improved, there was little incentive for farmers to organize and invest in irrigation management at the field channel level.
www.fao.org /docrep/W4367E/w4367e0r.htm   (3845 words)

  
 Formation of river deltas   (Site not responding. Last check: 2007-10-13)
At the mouths of the distributaries where the flanking levees are low and poorly developed, the river water spreads laterally and mixes more or less with the water of the adjoining basin.
During high discharges minor overflow channels may be formed, widening and deepening at the outside of bends, and especially at the distal part of the channels where the levees are low and poorly developed and the vegetation is sparse.
Since this is often the case, channel closing may take place when the equilibrium conditions are changing, and the competency and capacity of one branch decreases or increases in relation to the other.
home.swipnet.se /valter/df.html   (557 words)

  
 Cretaceous facies and fossil leaf beds
Because the pit is now being prepared for residential and commercial development, and the extraordinary geologic exposures on the south side of the pit have been destroyed by grading and planted grass, I wanted to preserve what was once exposed and the fossil leaves and flowers discovered there for future students of geology and paleobotany.
Nowhere else in New Jersey were deep bay transitioning to shallow bay, prodelta, distributary mouth bar, levee, crevasse splay, and peat-coal stringer deposits exposed to such an extent in one unbroken sequence vertically and laterally.
This is the first direct evidence of a distributary channel that prograded across the quarry from north to south (exposed at outcrop location A: see satellite image below).
www.sunstar-solutions.com /sunstar/Sayreville/Kfacies.htm   (3852 words)

  
 The Hindu : Karnataka News : Farmers block road, demand water
The farmers said that as against the sanctioned 90 cusecs of water to be released into the distributary canal, only 30 cusecs of water had been released so far.
They said water should be let into the distributary canals on rotation at an interval of 10 days and noted that since almost 25 days, the officials had not released water into the distributary canal (9B).
However, the farmers alleged that the section officers had released more water into the other distributary canals leading to villages of Harpanahalli, at the instance of the Harpanahalli MLA Parameshwara Naika.
www.hindu.com /2006/01/25/stories/2006012513280300.htm   (460 words)

  
 About IWMI
It had been pointed out that appropriate institutional reforms would be introduced in the water related sector in order to enlist the farmers’ participation in sharing the responsibility at the distributary level of the irrigation systems.
Thus a consultancy agreement was signed with IIMI to implement pilot projects in which water users organizations (WUOs) would be established to operate and maintain irrigation and drainage facilities in the distributary and minor command area.
The objective of this component was to provide the necessary insights on the organizational arrangements for farmers to interact with government agencies and effectively manage their resources.
www.iwmi.cgiar.org /pubs/PakistanSummaries/Report68.htm   (549 words)

  
 AGU Fall 2001 Abstract   (Site not responding. Last check: 2007-10-13)
The medial zone of the Mauna Ulu flow field (between the near-vent region and coastal plain) is considered to be predominantly composed of tube-fed pahoehoe emplaced as a series of large lobes with centralized, major feeder tubes.
These parts of the distributary system are small (up to a few meters in diameter), but appear to have transported significant volumes of lava given their lengths and the apparent volumes of associated breakouts and levee systems.
Identification and analysis of breakouts from the subsurface allow the complex patterns of overlapping surface units to be related to the distributary system, subsurface storage localities to be documented, and local flow stratigraphy to be interpreted.
www.pitt.edu /~mramsey/papers/agu_f01-dc.html   (311 words)

  
 Canal closure condemned -DAWN - National; November 20, 2003
Chotiari Distributary Farmers’ Organization chairman Gulsher Rind and vice-chairman Riaz Ahmad Bajwa told this correspondent that the control of regulators was in the hands of the irrigation officials and it was up to them to release water.
Mr Bajwa said that the distributary was opened on Nov 13 after it was closed on Nov 6 under the water rotation programme and again closed after the breach.
The delay in the water release was leading to a delay in wheat sowing which was at its peak in Sindh, the farmers’ leader said.
www.dawn.com /2003/11/20/nat41.htm   (263 words)

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