Overblog
Edit post Seguir este blog Administration + Create my blog
12 mayo 2011 4 12 /05 /mayo /2011 15:06

The floods hit already overpowered tens of thousands of acres of tilth in Siouan and lapped downtown Memphis, Tennessee …

Las inundaciones del Mississippi, este 2011, ya han afectado decenas de miles de acres de tierras labradas en Siouan y ha anegado el centro de la ciudad de Memphis en Tennessee, parte de los Estados de Arkansas, Illinois, Missouri, y amenazan con inundaciones a Mississippi y Lousiana. Lo peor está aún por venir. Los amenazados y afectados por las inundaciones deben estar informados a través de National News Service’s iReport, el servicio de noticias oficial de EEUU.

 

Aliviando el Mississippi

Sistema de diques protege de las crecidas del Mississippi

La región inferior y del delta del río Mississipi están protegidas por un sistema de diques construidos tras la gran inundación de  1927, que anegó más de ocho millones de hectáreas y causó la muerte de 500 personas. En 1937 se produjo otra, que marcó el récord de crecidas del mayor río de Norteamérica.

Gracias a los diques, la región está ahora mejor preparada para lidiar con las crecidas del Mississippi, el cuarto río más grande del mundo.

El deshielo de los glaciares en las fuentes del río y las lluvias intensas durante las últimas semanas se han combinado para producir una crecida que anega ciudades y tierras agrícolas en cientos de kilómetros.

El cauce principal del Mississippi está tan crecido este 2011, que no puede “absorber” el caudal de sus afluentes, que a su vez han anegado vastas regiones en los estados de Illinois, Missouri, Arkansas, Tennessee y amenazado con inundaciones a Mississippi y Lousiana.

En Lousiana, el Cuerpo de Ingenieros ya abrió parcialmente los desaguaderos del dique que desvía las aguas del gran río al lago Pontchartrain, al norte de Nueva Orleans, aliviando la presión sobre los diques que protegen a esa ciudad construida, en su mayor parte, a nivel inferior al del mismo lago.

.

Floods: The Mississippi River Crests
.
El Cuerpo de Ingenieros del Ejército de los EE.UU. abrió 38 compuertas más del aliviadero Bonnet-Carré en Norco, Louisiana, el miércoles, enviando millions de galones de agua del caudal del Mississippi al lago Pontchartrain y, finalmente, al Golfo de México. Ya el lunes, 28 compuertas habían sido abiertas…
.
The Corps unsealed 38 more move gates to the Bonnet Carre Spillway in Norco, Louisiana, northerly of New metropolis on Wednesday, sending jillions of gallons of liquid running into Lake Pontchartrain and, eventually, the Gulf of Mexico. On Monday, 28 gates were unsealed and an added 44 gates were unsealed on weekday to entertain floodwater. As the expanded humour progress closer, uneasy Louisiana residents are rigorous answers.
.
Photo: Norco, La., May 9, 2011
People gather to look at opened bays on the Bonnet Carré Spillway in Norco, La., on Monday, May 9, 2011. It marked the 10th time the structure has been opened since it was completed in 1931. The spillway diverts water from the Mississippi River to Lake Pontchartrain
.
Mississippi River
Miembros del Cuerpo de Ingenieros del Ejército de los EE.UU abre esclusas a lo largo del río Mississippi hacia el vertedero Bonnet Carré en Norco, Louisiana, el 9 de mayo de 2011 con el propósito de desviar las aguas del Río Mississippi hacia el lago Pontchartrain.
.
Pressure Relief
Photo: The U.S. Army Corps of Engineers opens up bays along the Mississippi River to the Bonnet Carré Spillway in Norco, La., on May 9, 2011 in order to divert Mississippi River water to Lake Pontchartrain.
.
Lake Pontchartrain and the Bonnet Carre Spillway, Louisiana
.

El lago Pontchartrain, al norte de Nueva Orleans, ocupa la parte superior de esta fotografía satelital del 29 de abril de 2008, el curso sinuoso y lodoso del río Mississippi serpentea a través de la parte inferior de la vista (el flujo es hacia el este, de izquierda a derecha). La ciudad de Nueva Orleans se encuentra entre el lago y el río.

 

Las fuertes lluvias en marzo y abril de 2008 en el área de influencia del Mississippi’s elevó los niveles de agua en el río suficiente como para que el Cuerpo de Ingenieros del Ejército tomara medidas para evitar las inundaciones. Para reducir el caudal del río a través de Nueva Orleans, el Cuerpo debió abrir el vertedero Bonnet Carre Spillway (inferior izquierda), que desvía parte de caudal del río en el lago Pontchartrain. Situado a unos 18 kilómetros (11 millas) río arriba desde Nueva Orleans, el vertedero Bonnet Carre Spillway tiene 1.6 kilómetros de ancho. La estructura de control del vertedero en sí es visible como una delgada línea discontinua blanca a lo largo de la orilla del río en esta imagen.

 

El vertedero sólo se ha abierto ocho veces desde 1937. La noticia de la apertura en abril de 2008 se transmitió a los astronautas a bordo de la Estación Espacial Internacional, que logró captar el efecto inmediato de agua turbia que fluye por el vertedero y desagua en el lago Pontchartrain. El “penacho” del vertido formas grandes lóbulos marrones en el agua siempre verde del lago. Estos lóbulos se movían lentamente hacia el este por la costa de Nueva Orleans. La línea de la Calzada del lago Pontchartrain, el puente más largo en los Estados Unidos, es visible en la foto.

 

El vertedero Bonnet Carre Spillway es la infraestructura de control de las inundaciones más meridional desarrollada por del Cuerpo de Ingenieros para el control de las aguas en el Valle del Bajo Mississippi. El vertedero Bonete Carre juega un papel importante en la protección de Nueva Orleans de las inundaciones. La apertura del vertedero protege la ciudad de varias maneras. En primer lugar, reduce los niveles de agua y reduce tanto la velocidad del flujo y la turbulencia y corrientes que cruzan el río, que puede interferir con los buques o incluso provocar colisiones con los diques. También reduce la presión sobre los diques río abajo, algunos de los cuales colapsaron durante el huracán Katrina en 2005

———-

Lake Pontchartrain, immediately north of New Orleans, occupies the upper part of this astronaut photograph from April 29, 2008, with the winding course of the muddy Mississippi River snaking across the bottom of the view (flow is eastward, from left to right). The city of New Orleans is sandwiched between the lake and the river.

Heavy rain in March and April 2008 in the Mississippi’s catchment area raised water levels in the river enough that the Army Corps of Engineers had to take action to prevent flooding. To reduce the volume of the river through New Orleans, the Corps opened the Bonnet Carre Spillway (lower left), which diverts some of the river’s flow into Lake Pontchartrain. Located about 18 kilometers (about 11 miles) upriver from New Orleans, the Bonnet Carre Spillway is a 1.6-kilometer-wide (1-mile) gap in the developments along the Mississippi River levees. The spillway control structure itself is visible as a thin, discontinuous, white line along the river’s edge in this image.

The spillway has only been opened eight times since 1937. News of the opening in April 2008 was transmitted to astronauts aboard the International Space Station who managed to capture the immediate effect of muddy water flowing down the spillway and into Lake Pontchartrain. The flood plume forms great brown lobes in the otherwise green water. These lobes moved slowly east along the New Orleans shoreline. The line of the Lake Pontchartrain Causeway, the longest bridge in the United States, is visible cutting across the lake.

As the southernmost spillway in the Corps of Engineers flood control infrastructure for the Lower Mississippi Valley, the Bonnet Carre plays a major role in protecting New Orleans from flooding. Opening the spillway protects the city in various ways. First, it lowers water levels and reduces both the speed of flow and cross currents in the river, which can interfere with vessels navigating the river—or even cause collisions with levees. It also reduces pressure on downstream levees, some of which famously collapsed during the onslaught of Hurricane Katrina in 2005

earthobservatory.nasa.gov/IOTD/view.php?id=8738

.

.

Bonnet Carre’ Spillway

.

.

12 May 2011 12:54 pm
Fears as floods advise south
.

The floods hit already overpowered tens of thousands of acres of tilth in Siouan and lapped downtown Memphis, Tennessee, are today in a steady, dewy territory finished Arkansas, river and Louisiana.

If you’re in an strained area, deal your news with National News Service’s iReport. Tunica, river — An excruciating threesome weeks await the residents of threesome gray states as a past batch upside tardily worked its artefact downstream weekday toward New metropolis along the river River. The floodwaters that hit already overpowered tens of thousands of acres of Siouan tilth and lapped at downtown Memphis, Tennessee, are today on a steady, heavy territory finished Arkansas, river and Louisiana. Flooding also continues to be a difficulty in south Siouan and gray Illinois, though the river and river rivers hit already decorated in those states. Gov. Bobby Jindal wise residents in south Louisiana weekday to egest their homes aweigh of the due inaugural of a conduit fashioned to entertain the near upside around the Crescent City

Forest creatures scarper broad “It is rattling important,” Jindal said, “even as we move to educate for the poorest and wish for the best.” Resilience and memories separate brawny in Louisiana batch regularize The underway distinction is at 1.36 meg boxlike feet per ordinal but when the river’s distinction reaches 1.5 meg boxlike feet of liquid per ordinal at Louisiana’s Red River Landing, the U.S. Army Corps of Engineers module unstoppered the Morganza Spillway and beam a stream of liquid downbound the Atchafalaya River, Jindal said. The Corps predicts the inaugural boundary module be reached sometime between Sat and Tuesday. “If the U.S. Army Corps of Engineers decides to unstoppered the Morganza Spillway, it could verify roughly a hebdomad from the period they start, and roughly 3,900 grouping and 2,600 structures would be compact by the broad water,” Jindal said. Some 26 parishes in the land hit proclaimed states of crisis aweigh of the surging waters. Floods penalise South, but locals feature location shall uprise again The scheme effect is meet first to be counted. In Arkansas, the Farm Bureau estimated alteration to the land cultivation could crowning $500 meg as more than a meg acres of cropland are underwater. In Mississippi’s Tunica County, ascension humour hit winking downbound profitable casinos that create $85 meg a period in taxes. “We’ve created a obstruction around the size of the cards and hotel,” said martyr Goldhoff, generalized trainer of the Gold Strike Casino. “As of now, we rest parched exclusive that perimeter.” Thirteen of the state’s casinos were winking Wednesday, with a 14th ordered to near Thursday, said Eddie reverend with the river Gaming Commission. The Ameristar and Riverwalk casinos in besieging rest open, but are existence monitored for doable closure. “The recreation authorisation is conducting regular assessments at the casinos to watch their status,” said comedienne Godfrey, support administrator of the land recreation commission. About 600 residents who ordinarily springy in the nearby accord of Tunica Cutoff aren’t healthy to convey home. “Some of the houses are completely submerged,” according to evacuee archangel Dews. “Ninety-eight proportionality of the houses downbound there hit anywhere from 4 to 6 feet of water.”

.
.
.
New Orleans, Louisanna, April 10, 2008 — Heavy rain in the Mississippi Valley is prompting the U.S. Army Corps of Engineers to open the Bonnet Carré Spillway on Friday, April 11, 2008, for the first time in 11 years.
.

Bonnet Carré, located 28 miles above New Orleans, is a vital element of the multi-state Mississippi River and Tributaries (MR&T) system, which uses a variety of features to provide flood protection to the alluvial Mississippi Valley from Cape Girardeau, Mo., to Head of Passes. MR&T features include levees and floodwalls to contain flood flows, floodways (such as Bonnet Carré) to redirect high flows out of the Mississippi River, reservoirs and pumping plants for flood control drainage, and channel improvement and stabilization features to protect the levees and improve navigation of the river.
Bonnet Carré is the southernmost floodway in the MR&T system. Located on the east bank in St. Charles Parish, it can divert a portion of the river’s floodwaters via Lake Pontchartrain into the Gulf of Mexico, thus allowing high water to bypass New Orleans and other nearby river communities. The structure has a design capacity of 250,000 cfs, the equivalent of roughly 1,870,000 gallons per second.

The Bonnet Carré structure consists of a control structure and a floodway. The control structure is a concrete weir that parallels the river for a mile and a half. It consists of 350 gated bays, each holding 20 timber “needles,” for a total of 7,000 needles. When needles are removed, river water flows into the floodway and is conveyed nearly six miles between guide levees to the lake. Operation of the structure is relatively simple. Two cranes, moving on tracks atop the structure, lift timbers from their vertical position in the weir and set them aside. A complete opening of all 350 bays is not planned at this time.

Bonnet Carré was first opened during the flood of 1937; since then it has operated seven other times, during high water in 1945, 1950, 1973, 1975, 1979, 1983, and 1997. The flood of 1997 was the last time the spillway was operated.

—-

Read more:
GRANDES DESBORDES DEL MISSISSIPPI DEL 2011 PUEDEN ... - cinabrio blog
11 May 2011 ... Mississippi River: Heavy rains create widespread flooding from Illinois to Louisiana.Alimentado por las lluvias primaverales y el deshielo ...
cinabrio.over-blog.es/article-grandes-desbordes-del-mississippi-del-2011-pueden-marcar-un-record-historico-73651886.html 
 
.

Compartir este post

Repost0

Comentarios

Présenta

  • : cinabrio blog
  • : Ecología y sostenibilidad socioambiental, énfasis en conservación de ríos y ecosistemas, denuncia de impacto de megaproyectos. Todo esto es indesligable de la política y por ello esta también se observa. Ecology, social and environmental sustainability, emphasis on conservation of rivers and ecosystems, denounces impact of megaprojects. All this is inseparable from politics, for it, the politics is also evaluated.
  • Contacto

Perfil

  • Malcolm Allison H malcolm.mallison@gmail.com
  • Biólogo desde hace más de treinta años, desde la época en que aún los biólogos no eran empleados de los abogados ambientalistas. Actualmente preocupado …alarmado en realidad, por el LESIVO TRATADO DE(DES)INTEGRACIÓN ENERGÉTICA CON BRASIL
  • Biólogo desde hace más de treinta años, desde la época en que aún los biólogos no eran empleados de los abogados ambientalistas. Actualmente preocupado …alarmado en realidad, por el LESIVO TRATADO DE(DES)INTEGRACIÓN ENERGÉTICA CON BRASIL

Recherche

Liens