a groin strain. This is by no means always the case, however, and there are several examples of quite unpredicted erosion and loss of property resulting from construction in such areas. Since water is forced to recirculate within the groyne field in spiraling trajectories, the local residence time for suspended particulate matter can increase substantially and may be sufficient to maintain local phytoplankton reproduction. A groyne's length and elevation, and the spacing between groynes is determined according to local wave energy and beach slope. Measured distributions of depth-averaged time–mean velocities (section through the gyre center) in the mixing layer between main flow and groyne field, and their approximation with hyperbolic tangent (eqn [10]). A jetty, often very long (thousands of feet), is intended to keep sand from flowing into a ship channel within an inlet and to reduce the cost of channel maintenance by dredging. The northern groyne, 40 m long, is therefore extended of 80 m. Also the Southern groyne is extended, just 40 m, with the aim of stabilising the coast orientation. One remedy is, of course, nourishment by transferring sand from the updrift side of the construction to the downdrift side. In 2001 the following works were performed, in order to increase the efficiency of the shore protection system: increase of the crest height of the barrier by one stone layer, approximately 0.80 m; construction of a submerged groin 120 m long connecting the southern groyne to the barrier; Figure 11.38 shows the aerial view of Lido di Dante, with indication of all the works carried out from 1978 till 2001. After one groin is built, the increased rate of erosion effect on adjacent beaches has to be addressed. No need to register, buy now! Some designs are referred to as T-groins because the end of the structure terminates in a short shore-parallel segment. Among the several examples cited by Komar (1998), the development of the Port of Madras in India is of particular interest because it was constructed on the open shore in an area of strong longshore drift and because resulting changes have been documented since its construction was sanctioned in 1875 (Figure 15.8). Sediment is eroded and then transported by rivers to the ocean. Spend enough time on or near the sea and the reason becomes apparent. See groin in the Oxford Advanced Learner's Dictionary. Englisch-Deutsch-Übersetzungen für groin im Online-Wörterbuch dict.cc (Deutschwörterbuch). With the notable exception of Castelle and Coco (2013) and McCarroll et al. The groin area, also called the inguinal region of the body, can be affected by deep vein thrombosis, or DVT. The term is sometimes confused with loin, which is on the back between the lowest ribs and the back of the pelvis. 1. the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals 2. a curved edge formed by two intersecting vaults 3. a protective structure of stone or concrete; extends from shore into the … Accretion May be either natural or artifical. Intertidal definition is - of, relating to, or being the part of the littoral zone above low-tide mark. English Wikipedia - The Free Encyclopedia. Définition groin dans le dictionnaire de définitions Reverso, synonymes, voir aussi 'groiner',groiner',giron',groupin', expressions, conjugaison, exemples (A hairdryer is useful if you have hairy groins.) groin translation in English - French Reverso dictionary, see also 'groin injury',groin strain',grin',groping', examples, definition, conjugation Groins are much shorter structures built on straight stretches of beach away from inlets. nase, barbel and grayling). The length of the groyne is designed in order to trap a fraction of the transport. Intensive regulation and channelisation of the Vistula started at the end of the 19th century. A breakwater, which is a manmade structure, is similar to the naturally formed barrier island. This process is known as terminal groyne syndrome, because in a series of groynes it occurs after the terminal groyne (last groyne on the downdrift side of the beach or coastline). Groin A low artificial wall-like structure of durable material extending from the land to seaward for a particular purpose, such as to prevent coast erosion. Groynes can be submerged or not under normal conditions. Inlet stabilization adjacent to Assateague Island National Seashore, Maryland and Virginia. A coastal protection scheme very often contains combinations of some of the mentioned elements. Nase, barbel and dace became almost extinct; chub and gudgeon are now considered vulnerable (Kruk & Penczak 2003). noun. Translate groin into Spanish. It is not that erosion fails to occur on a coast with zero net drift but that following construction of a barrier a new equilibrium is established, an equilibrium that may in fact involve drastic changes to the shoreline. Groin top surface elevation is approximately equal to the mean high tide line or lower, and the slope of seaward groin surface can be about 1% (Yan and Liang, 2001). The length of time it has been blowing. Groin Definition: Your groin is the front part of your body between your legs. Groynes can be attracting, deflecting or repelling. Four permit applications for construction of a terminal groin have been submitted to the federal U.S. Army Corps of Engineers’ district office: Figure Eight Island, Ocean Isle Beach, Holden Beach and Bald Head Island. Per Bruun, past director of the Coastal Engineering program at the University of Florida, has observed that, on a worldwide basis, groins may be a losing proposition, i.e. But why do we need to know that? water that lies beneath the surface of the ground (5.2) Gulf Stream ‘When a school passes beneath a pier or drifting boat, or within casting distance of a rock groin or favorite stretch of beach, every bait in its path gets picked up.’ ‘Previously, the Port Authority has come out in favour of an eastern breakwater rail option, which would see a rock groyne extended out into the ocean.’ Most common use of groins along a beach ( 13.5 ) groin field a. Of other well-documented examples could be recovered eel, reintroduced Atlantic salmon and lampreys are seriously (... Limit its effectiveness ( Kruk & Penczak 2003 )... wall built at a right angle to the of! Up an eroded beach by dredging and filling have apparently only been successful in Vistula... 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