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far greater than amounts deposited by the local river systems. Based annualized estimates of magnitude of sediment deposition, hurricanes have been found to deposit hundreds of times more sediment in these coastal wetland regions than man-made river diversions intended to redirect river-transported sediment to starving wetland systems. For salt marsh wetlands, particularly those of coastal
Louisiana, sediment accumulation from hurricanes is "sufficient" to account for the entire inorganic sedimentary budget.
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transport sediment away from a coastline. An example of both extremes of longshore drift can be found on the
Canterbury coastline in New Zealand, either side of Banks Peninsular. Both the Waimakariri River in the north and the Canterbury Bight in the south of the Banks Peninsula provide large amounts of sediment respectively. The difference is the sediment supplied by the Waimakariri River is a source for the coast's
303:. As the tide rises and falls water and sediment is pumped into the estuary. Because salt water and sediment particles are heavier than fresh water they tend to be carried the bottom until the sediment sinks to the floor and is trapped within the estuary. The movement of sands and offshore material into an estuary generally depends on the direction of longshore drift and the movement of bottom waters across the
17:
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shoreline can be very intermittent mostly occurring during floods with the increase in flow typically creating an increase in sediment supplied to the coast. Some rivers are referred to as ‘large’ because they produce high amounts of sediment for which to nourish the coastal environment. For example, the
89:
equilibrium erodes during a storm it forms an offshore bar that in turn forces waves to break over it. By doing this the waves lose a lot of energy and dissipate before reaching the shoreline, significantly reducing further erosion. When the storm calms, the bar is then re-worked back on to the beach.
467:
When protecting the coastline it is important to understand how the sedimentary budget can be affected when implementing appropriate coastal protecting techniques. Often management plans for coastal erosion have seen the use of ‘hard’ engineering structures as a means of protecting the coastline from
77:
In order to understand the sedimentary budget of a coastal environment it is important to know the different types of feedback that can determine whether there is stability. When a beach environment is effected by wind, wave and tidal energy it responds with either positive or negative feedback which
44:
To assess the sedimentary budget the coast has to be divided into two separate morphologies, commonly known as littoral cells and compartments. Sediment compartments can usually be defined as two rocky barriers which mark the ends of a beach and have a fixed sediment budget, although usually leaky to
276:
in 2005, over 131 x 10 metric tons of sediment were deposited along the
Louisiana and eastern Texas Gulf Coast. Study of the western Louisiana coastal wetlands found hurricanes appear to be the "overwhelming pathway" by which sediment is deposited in that location, accounting for amounts of sediment
453:
m. When ongoing dredging at the entrance to the
Tauranga Harbour began, it was decided that the sediment removed would be used to re-nourish the Mt. Manganui beach. The sediment was deposited in the nearshore zone promoting beach accretion by offshore berm emplacement. Results show that most of the
159:
Rivers are major point sources of sediment contribution to the coastal sedimentary budget, this being particularly true of coasts with a steep gradient, where rivers directly dump their sediments at the coast. Coasts with a low gradient may lose river sediment to estuaries. Sediment delivery to the
116:
and rocky headlands are thought to be boundaries for littoral cells. Boundaries of littoral cells have been defined using tracer studies of sediment movement, geomorphological observation and sedimentological description, heavy mineral sourcing, and analysis of the spatial distribution of wave flux
353:
due to the reversal of southern currents transporting sediment to the south. In contrast the
Canterbury Bight has a combination of high energy environments and strong southern longshore currents that transport large amounts of sediment north, which can be classified as a sink, putting a deficit to
108:
Compartmentalisation of the shore occurs where there are major obstacles or objects, especially headlands on deeply embayed coasts. The beaches that are the most enclosed are commonly known as pocket beaches. On these type of beaches the volume of sand remains constant and are closed compartments.
415:
and currents can impact significantly on the sediment budget, although it is difficult to measure. Swash can be either an erosive or accretion process depending on many factors such as the sand texture and the individual wave itself. Although during fair weather the impact of swash is negligible,
345:
Longshore drift of sediment is important for distributing sediment along the coast, and is considered one of the most important mechanisms. The longshore drift of sediment can be considered both a source and a sink due to the fact that in some case it can add sediment to a coastline but in others
1038:
Cowell, P. J., Stive, M.J.F., Niedoroda, A.W., Swift, D.J.P., de Vriend, H.J., Buijsman, M.C., Nicholls, R.J., Roy, P.S., Kaminsky, G.M., Cleveringa, J., Reed, C.W. and de Boer, P.L., 2003b. The coastal-tract (part 2): Applications of aggregated modeling of lower-order coastal change. Journal of
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here are poorly understood. There are three kinds of boundaries between littoral cells: longshore, landward, and seaward; across which sediment may enter the littoral cell or leave it by various processes. It is important to identify which processes operate on a particular littoral cell and also
481:
Being able to incorporate the sedimentary budget into a coastal management plan is becoming critical, especially in today's world where the majority of populations are living and owning property very close to the coast. One of the essential components drawn from sediment budget is being able to
121:
exclude sediments). Sub-cells are usually defined to better measure the sediment budget of a coast with varying rates of accretion and erosion. The landward boundary of a littoral cell is usually the foot of a dune or cliff, however, the seaward boundary is difficult to define as mechanisms of
120:
Littoral cells are usually an area where changes in the volume of sediment directly affects changes in the coastline, and ideally they are defined to minimise longshore sediment exchange with other littoral cells, for example, a pocket beach surrounded by rocky headlands (which are presumed to
472:
which are used to trap the longshore drift of sediment that often deprives a beach. Groynes have the ability to change the coast's sediment budget, accreting up drift beaches but at the same time starving down drift beaches. This management approach is not used so much these days, with modern
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m of sediment added to the nearshore zone made it to ashore to re-nourish the beach and even out the past sediment deficit. Nourishment of a coast can be regarded as a fast fix option to reversing a sediment deficit; however, it is important that nourishment is on-going in order to ensure the
88:
is a stabilising mechanism acting to oppose changes to coastal morphology and establish equilibrium. A coastal environment in equilibrium is able to dissipate or reflect incoming energy without the occurrence of sediment input or output and change to morphology. For example; when a beach in
490:
zones, beach property protection, and coastal erosion as well as assess the successfulness of current management strategies. The major setback with using the sediment budget for management and what is probably the underlining issue regarding the sediment budget is its complexity.
482:
predict the morphological change that is likely to occur to a coastline over time, especially when creating plans associated with major environmental change such as sea level rise. Incorporating a sediment budget into a coastal plan has been recognised as highly important in the
224:
m of gravel is extracted from the San Luis Rey River in South
California every year, which is almost 50 times more than the bedload sediment yield after the dam was built. Thus, removing more bedload sediment further decreases the sediment yield available to the coast.
27:
are a coastal management tool used to analyze and describe the different sediment inputs (sources) and outputs (sinks) on the coasts, which is used to predict morphological change in any particular coastline over time. Within a coastal environment the rate of change of
1034:
Cowell, P. J., Stive, M.J F., Niedoroda, A.W., de Vriend, H.J., Swift, D.J.P., Kaminsky, G.M. and
Capobianco, M., 2003a. The coastal-tract (part 1): A conceptual approach to aggregated modeling of low order coastal change. Journal of Coastal Research, 19,
240:
Sea cliff erosion is a large source of sediment to many coastal sedimentary budgets, initiated by many different processes including wave attack, rainfall and groundwater seepage. Cliff erosion can be influenced by rising sea levels and is magnified with
214:
The effects of sediment trapping due to dams can be exacerbated when combined with other activities such as in-stream gravel mining. Excavation of gravel from a river bed forms pits within the channel profile which can trap much of the incoming
32:
is dependent on the amount of sediment brought into the system versus the amount of sediment that leaves the system. These inputs and outputs of sediment then equate to the total balance of the system and more than often reflect the amounts of
195:, dams are built to control flooding of properties along the river. Ironically, in doing so, this is contributing to the damage of coastal properties due to a lack of sediment produced to protect the beaches. Another example is the
109:
Littoral cells can be defined as sediment within a coast that is circulated e.g. rip currents. Littoral cells usually develop on coast which are not impeded by headlands and where longshore currents are allowed to develop.
219:
sediment, preventing or slowing it from reaching the coastline. Mining can also reducing the amount of overall sediment available for transport, especially when it occurs down stream from dams. For example; approximately
398:
ebb-tidal shoals, which store sand that has been transported by long shore transport. As well as storing sand these systems may also transfer or by pass sand into other beach systems, therefore inlet ebb-tidal
298:
Estuaries are an example of a coastal sink in that they tend to trap sediment which can be due to tidal circulations and the mixing of fresh and salt water, the injection of river sediment and the presence of
59:
Anthropogenic activities can also influence sedimentary budgets; in particular damming of a river and in stream gravel mining of a river bed can reduce the sediment source to the coast. In contrast
96:
pushes a coastal system away from equilibrium by modifying its morphology until a threshold is reached, whereby a different type of response occurs. For example; if a storm event was to breach the
311:
of New
Zealand experiences sediment sinks into estuaries often, enhanced by the presence of mangroves. Mangroves are sediment hungry and trap a lot of suspended sediment with their complex aerial
100:
of a beach that is not in equilibrium, a vulnerable area would be created, which in turn would become susceptible to the formation of a blowout due to wind exploiting the absence of vegetation.
211:
every year. Sediment supply is now almost zero which has produced a significant imbalance to the near shore sedimentary budget, creating major erosion and shifting of sediment along the coast.
323:
Sand that is blown by the wind inland to form sand dunes usually develop on shorelines where there is suitably strong winds. This can be a major sink for the sediment budget of a shoreline.
394:
This sediment then enters the coastal system and is transported by longshore drift. A good example of the sediment budget and longshore drift working together in the coastal system is
228:
The removal of natural vegetation for cultivation and land use can increase soil erosion resulting in an increase in sediment yield transported by rivers to the coast. For example; in
172:
coastline. This is not always the case with some rivers referred to as ‘small’ because they struggle to supply enough sediment to keep their coastlines from eroding, for example, the
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during storms the sea level can rise high enough to erode dunes and cliffs, dumping large quantities of sediment into the littoral cell, which can only be given back to the dune by
973:
Foster, G; Healy, T; Lange, W. (1994). "Sediment Budget and
Equilibrium Beach Profiles Applied to Renourishment of an Ebb Tidal Delta Adjacent Beach, Mt. Maunganui, New Zealand".
629:
Bryan, K, Kench, P and Hart, D, 2008,”Multi-decadal coastal change in New
Zealand: Evidence, mechanisms and implications”, New Zealand Geographer, vol.64, pg. 117-128
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Bishop, P. and Cowell, P., 1997. Lithological and drainage network determinants of the character of drowned, embayed coastlines. Journal of Geology, 105, 685-699.
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Models have been developed for measuring longshore drift which can assist in determining a sedimentary budget, if they are integrated over the correct timescale.
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Although less frequently observed than river transport and sea cliff erosion, storms may account for a large percentage of coastal sedimentary budgets. Following
69:
Sedimentary budgets are used to assist in the management of beach erosion by trying to show the present sediment movement and forecast future sediment movement.
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important to identify sediment sources and sinks, as by measuring the sediment gained or lost by these sources and sinks, a sediment budget can be determined.
875:
1082:
Sanderson, P. G and Eliot, I. 1999. Compartmentalisation of beachface sediments along the southwestern coast of Australia. Marine Geology 162, 145-164.
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knowledge of coastal dynamics promoting the use of ‘soft’, natural approaches such as nourishment and preservation of natural systems such as dunes.
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in New Zealand. The erosion of these cliffs, due to high energy wave environments contributes 70% of the overall material supplied to these beaches.
1018:
Komar, P, 2005, “Hawke’s Bay, New Zealand: Environmental Change, Shoreline Erosion and Management Issues”, Report for Hawke’s Bay Regional Council.
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reduces sediment supply to many coastlines due to the trapping of sediment and the decrease in flood peaks and flood intensity. In places such as
48:
There are various types of natural sources and sinks within a coastal system. Sediment sources can include river transport, sea cliff erosion and
1085:
Short, A.D. 2010. Sediment transport around Australia – sources, mechanisms, rates and barrier forms. Journal of Coastal Research, 26(3) 395-402.
421:
695:"Effect of the Aswan High Dam on the Nile flood and on the estuarine and coastal circulation pattern along the Mediterranean Egyptian coast"
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some extent. Littoral cells can either be free or fixed and can occupy a hierarchy of scales, from individual rip cells to entire beaches.
307:. Estuaries can often trap a lot of coarse bedload sediments that are fed down rivers, intercepting them before they reach the coast. The
20:
Diagram of accretion and erosion of sediments in a coastal system. Black arrows indicate accretion, and white arrows indicate erosion.
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the coasts sedimentary budget. As a result, there is erosion of the Canterbury Bight and a predominantly balanced New Brighton Spit.
801:
Hart D, Marsden I, Francis M. 2008. Chapter 20: Coastal Systems. In: Winterbourne, M, Knox, G.A. Marsden, I.D., Burrows, C (eds.)
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in 1964. Prior to the construction of the Aswan Dam, the Nile River delivered 60-180 million tonnes of sediment and water to the
232:
New Zealand this has had a cumulative effect with clear felling of trees increasing in river sediment yield up to eight times.
112:
Identifying littoral cells is crucial to determine the sediment budget of sandy coasts. In south-west Western Australia, large
642:
Kirk, R. (1991). "River-beach interactions on mixed sand and gravel coasts: a geomorphic model for water resource planning".
618:
560:
Sanderson, P.G.; Eliot, I. (1999). "Compartmentalisation of beachface sediments along the southwestern coast of Australia".
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beach in the North Island of New Zealand which had been experiencing erosion, resulting in coastal dune retreat of almost 20
66:
In 1966, Bowen and Inman defined a littoral cell and separated sediment inputs, accretion by longshore drift and outputs.
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Riedhammer, C.; Schwarz-Schulz, B. (2001). "The newly proposed EU risk assessment concept for the sediment compartment".
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into an area. Sediment sinks can include longshore drift of sediment away from an area and sediment deposition into an
772:
Shih, S; Komar, P (1994). "Sediments, Beach Morphology and Sea Cliff Erosion within an Oregon Coast Littoral Cell".
610:
898:
438:
831:
Meade, R (1982). "Sources, Sinks, and Storage of River Sediment in the Atlantic Drainage of the United States".
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transport. Where storm surge causes sediments to be deposited on the land from the littoral cell, they can form
1000:
Fletcher, C; Mullane, R; Richmond, B (1997). "Beach loss along armoured shorelines on Oahu, Hawaiian Islands".
38:
938:
Michel, D; Howa, H.L (1997). "Morphodynamic behaviour of a tidal inlet system in a mixed-energy environment".
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management has been adopted all over the world in order to preserve and protect. An example of this is at
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sediment nourishment is one way in which a balanced sedimentary budget can be maintained. This type of
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Davies, J. L., 1974. The coastal sediment compartment. Australian Geographical Studies, 12, 139-151.
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364:. This sediment can come from any source with examples of sources and sinks consisting of:
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Kondolf, G, 1997,”Hungry Water: Effects of Dams and Gravel Mining on River Channels”,
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Turner, R. Eugene, et al. "Wetland sedimentation from hurricanes Katrina and Rita."
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Walling, D (1999). "Linking land use, erosion and sediment yields in river basins".
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or open a new tidal inlet which transports sediment away from the littoral cell.
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The sediment budget takes into consideration sediment sources and sinks within a
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List, Jeffrey H. (2005) "Sedimentary budget" in Schwartz, Maurice L. (e.d.)
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Port and coastal engineering developments in Science and technology
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systems provide a good sources and sinks for the sediment budget.
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511:, Prentice Hill, Upper Saddle River, New Jersey, no.2, pg. 66-72
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A mangrove can trap sediment with its aerial root structures.
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events. An example of cliff erosion is the erosion of large
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International Journal of Tropical Biology and Conservation
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805:(3rd edn). Canterbury University Press, 30p, pp 653-684
168:, New Zealand produces 77% of sediment supplied to the
151:, New Zealand produces 77% of sediment supplied to the
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The construction of river dams for flood control and
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Introduction to coastal processes and geomorphology
486:of New Zealand for finding information relating to
437:When a coastal environment is in sediment deficit,
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78:determines whether the system is balanced and in
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876:"How do mangrove forests induce sedimentation?"
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315:structure, thus functioning as land builders.
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609:(Encyclopedia of Earth Sciences Series)
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607:Encyclopedia of Coastal Science
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1048:Journal of Soils and Sediments
1039:Coastal Research, 19, 828-848.
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63:can increase sediment source.
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774:Journal of Coastal Research
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256:, situated north of the
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574:1999MGeol.162..145S
433:Coastal nourishment
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25:Sedimentary budgets
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193:San Luis Rey River
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319:Aeolian transport
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270:Hurricane Katrina
236:Sea cliff erosion
209:Mediterranean Sea
162:Waimakariri River
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258:Waitaki River
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250:alluvial fans
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899:the original
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309:North Island
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174:Rakaia River
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92:In contrast
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24:
23:
745:: 223–240.
484:Hawke's Bay
247:Pleistocene
243:storm surge
170:Pegasus Bay
153:Pegasus Bay
80:equilibrium
1054:(2): 105.
495:References
428:Management
201:Nile River
185:hydropower
166:Canterbury
155:coastline.
149:Canterbury
301:mangroves
294:Estuaries
197:Aswan Dam
176:South of
39:accretion
1093:Category
1076:83594496
1035:812-827.
895:15162728
861:96470785
759:42783295
611:Springer
230:Westland
217:bed load
98:foredune
30:sediment
1056:Bibcode
987:4298253
948:Bibcode
841:Bibcode
819:Science
786:4298199
707:Bibcode
652:Bibcode
570:Bibcode
470:groynes
418:aeolian
374:Lagoons
220:300,000
130:Sources
54:estuary
35:erosion
1074:
985:
893:
859:
784:
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617:
488:hazard
456:
454:80,000
451:
369:Rivers
362:system
264:Storms
222:
135:Rivers
1072:S2CID
983:JSTOR
902:(PDF)
879:(PDF)
857:S2CID
782:JSTOR
755:S2CID
413:swash
411:Wave
401:shoal
396:inlet
281:Sinks
205:Egypt
891:PMID
615:ISBN
351:spit
313:root
272:and
143:The
1064:doi
956:doi
849:doi
747:doi
743:410
715:doi
660:doi
578:doi
566:162
37:or
1095::
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930:^
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