Prevención de Desastres (CENAPRED), mediante visitas de campo y súbitas en zonas rurales, con arrastre de sedimentos”, en Atlas Nacional de Riesgos. Distribución de población: 85% urbana y 15% rural; a nivel nacional el dato es de 76% y 24% respectivamente. Atlas Nacional de Riesgos. Distribución de población: 66% urbana y 34% rural; a nivel nacional el dato es de 76 y 24% respectivamente. Atlas Nacional de Riesgos.
|Published (Last):||15 June 2013|
|PDF File Size:||20.59 Mb|
|ePub File Size:||3.12 Mb|
|Price:||Free* [*Free Regsitration Required]|
To this end, however, authorities and society should:. A risk-management approach should be followed —including landscape planning— for regions that are highly vulnerable to intense rainfall.
Agrociencia43 5 Slopes and compactness are also nacionak factors but these can be considered as static. The compactness index Ci is calculated through the empirical relationship:. Effects of land-use change on channel morphology in northeastern Puerto Rico.
Protección Civil :: Colima
The hazard may be characterized as condition of extreme weather in a period of time, for instance by means of the 95 th percentil of daily precipitation, which indicates where extreme events have a certain intensity. Natural Hazards56 1 Consultado el 15 de junio de de Consultado el 15 de junio de de http: These factors should be considered as part of a comprehensive flood risk analysis in order to reduce the negative impacts of floods on a more exposed society.
However, there are no adequate data to quantify it, and thus it is not considered in this work Clark and Wilcock, Direct runoff, Q, as a function of CN was calculated in the present study for rainfall values larger than P In Mexico, the number of floods is increasing DesInventar, Fig. Therefore, the changes in land cover in Mexico, mainly associated with deforestation, have led to increased runoff and reduced infiltration capacity, creating favorable conditions for flooding.
Protección Civil :: Baja California Sur
Environmental monitoring and assessment64 1 The vulnerability index increased in most regions between andalthough it decreased in some areas Fig. The rapid transformation of the Mexican territory during the twentieth past century has led to significant vegetation cenaprev Mas et al. Aatlas human cost of poor preparation for disasters. To this end, however, authorities and society should: Vulnerability assessment in natural hazard and risk analysis: There are more flood reports for central and southern Mexico than for northern Mexico, not only because intense rainfall is more frequent, but also because deforestation is more severe in the former.
The dynamics of vulnerability is an important element in risk analysis. As landscapes change from forests to agriculture and cattle-ranching land, or to urban settlements, they become less permeable and thus more vulnerable to intense rainfall since water does not infiltrate and accumulates at the surface, hence causing floods Singh and Singh, A Sociological Perspective on Disasters.
Atmospheric data analysis No.
Precipitation rapidly exceeded mm in a single day and more than mm in three days in the Papagayo basin. In some arid regions of northern Mexico, including the southern Baja California peninsula and northeastern Mexico, P95 is large due to the atlxs of tropical cyclones even when the annual cumulative rainfall is low.
The regions that show the largest increase in flood occurrence Fig.
When flood activity is calculated on an annual basis, the associated vulnerability varies gradually following a logarithmic function, as deforestation and land-cover changes progress Fig. We have developed a methodology to estimate flood risk associated with heavy rainfall considering changes in land cover and use, terrain slope and basin compactness are key vulnerability factors.
Once the hazard and the vulnerability are obtained, an estimate of risk under intense rainfall can be determined and compared with disaster events. Monthly Cwnapred87 10 Linking land use, erosion and sediment yields in river basins. Natural Hazards64 3 Chapter 10 Estimation of direct runoff from storm rainfall.
There are significant spatial contrasts in the magnitude of P95 Fig. In Acapulco, vulnerability and hazard increased in recent years, and hence the frequency of flood events Fig.
naciknal Under a simple naturalistic focus, one may think that the change in the hydrological cycle climate change has led to the increased frequency in the number of floods observed, but from a risk perspective one should consider changes in the natural hazard as well as in the vulnerability context in which more frequent intense rainfall is now occurring. The nacionao in the number of days with precipitation above P95 shows that more frequent intense rainstorms are occurring over a large area of the Mexican territory Aguilar et al.
Baja California Sur
Consultado el 15 de junio de de Consultado el 15 de junio de de https: Consultado el 15 de riesgoos de en Consultado el 15 de junio de en http: A method for estimating volume and rate of runoff in small watersheds.
Water4 2 It was found that over most of the Mexican territory, more frequent floods are the result of a giesgos deforestation process. Only in some parts of the country, such as Baja California Sur, the increased frequency of intense rainfall i. Flood damage, vulnerability and risk perception-challenges for flood damage research. Cuenca model del Sistema serrano de La Venta Argentina.
It navional found that the likelihood of flood reports in the increases over time as a result of a higher vulnerability and not always due to more intense rainfall activity.