River systems and flood problem in Jalparguri district, West Bengal
Rivers in this district of West Bengal alter the landscape by their floods, which are still a menace. An attempt has been made to depict the flood hazards in the river systems of the district. - (PLK)
The pattern of flood hazard in the Karoo environment of South Africa
The flood problem of the semi-arid lands of the Cape Province is examined and two particularly susceptible regions are identified for flood control and relief strategies. - (AJC)
Hyperconcentrated floods occur frequently in the Yellow River and its tributaries on the Loess Plateau. This paper studies the fluvial hydraulics of hyperconcentrated floods by statistical analysis and comparison with low sediment concentration
floods. The fluvial process induced by hyperconcentrated floods is extremely rapid. Serious channel erosion occurs in narrow-deep channels during hyperconcentrated floods. However, in wide-shallow channels, hyperconcentrated floods may result in serious
sedimentation. Moreover, a hyperconcentrated flood may cause the channel to become narrower and deeper, thus, reducing the flood stage by more than 1 m if the flood event lasts longer than one day. The fluvial process during hyperconcentrated floods also changes
the propagation of flood waves. Successive waves may catch up with and overlap the first wave, thus, increasing the peak discharge of the flood wave during flood propagation along the river course.
Pleistocene cataclysmic flooding along the Big Lost River, east central Idaho
Climatic variation ; Flood ; Glaciation ; Hydrodynamics ; Idaho ; Palaeogeography ; Pleistocene ; Quaternary ; United States
Relationships between cataclysmic flood-generated landforms and flood hydraulics were investigated along Box Canyon, an 11 km long bedrock gorge of the lower Big Lost River. Geomorphic mapping along Box Canyon indicates that a cataclysmic flood
completely inundated the gorge, resulting in large-scale erosional and depositional features on the adjacent basalt upland. Outburst floods from a glacial lake in headwater regions during the late Pleistocene may have induced the torrential discharges within
Arizona ; Flood ; Fluvial processes ; Forecast ; Modelling ; Natural hazards ; Palaeohydrology ; Statistics ; United States
In contrast to the conceptual, theoretical treatment of floods as classes or generalizations, geomorphologists study particular floods revealed as a natural experience that is recorded in the sediments, landforms and erosional scars of past floods
. The strength of this approach is in its affinity to the commonsense perceptional basis that underpins human action. Geomorphological floods studies, including recent advances in paleoflood hydrology, are needed as a complement to conventional hydrological
Some considerations on self-regulation in the evolution of some flood plains in the Central Moldavian Plateau
This paper concerns with the morphometry of the flood plains. Against the general conception that a flood plain widens from upstream to downstream, the AA. point out that, at least in the Moldavian Tableland, the width of a flood plain increases
only together with the increase of Strahler order; moreover, between two successive confluence of the same or of close orders, a flood plain narrows from upstream to downstream, being regenerated by a new confluence. This tendance is a general rule
in the Moldavian Tableland, and seems to have a large extension in the Romanian flood plains. - (E. Rusu).
Method of directional statistic was used to express spatial dissimilarity of flood occurrence seasonality. Output resulting from application of this method is determination of the flood occurrences mean day within the year in the examined river
basin and furthermore the time dispersion index of flood events.Based on these directional characteristics applied on sets of selected river basins, the Czech Republic territory can be divided into regions according to flood occurrence frequency
Cataclysmic late Pleistocene flooding from glacial Lake Missoula: a review
Late Wisconsin floods from glacial Lake Missoula occurred between approximately 16 and 12 ka BP. Many floods occurred| some were demonstrably cataclysmic. After resolution of the scabland's origin by cataclysmic outburst flooding from glacial Lake
Missoula, research since 1960 emphasized details of flood magnitudes frequency, routing and number. Major advances have been made in the study of low-energy, rhythmically bedded sediments that accumulated in flood slack-water areas.
Peak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA
Arizona ; Canyon ; Catastrophe ; Flood ; Modelling ; Pic discharge ; Pleistocene ; Stream ; United States of America
Here, the AA. report the results of hydrologic modeling of the flood wave representing one of these outburst floods, an event that occurred 165,000 yr ago with the failure of the Hyaloclastite Dam. The AA. used dam-failure and unsteady flow modeling
to estimate a peak discharge and flow hydrograph. Moreover, the Hyaloclastite outburst flood is the oldest documented Quaternary flood and one of the largest to have occurred in the continental USA.
Terminal lake flooding and wetland expansion in Nelson County, North Dakota
This paper examines the physical dimensions of 2 colocated distinct flood hazards, terminal lake flooding and wetland flooding, in the Stump Lake closed subbasin within the prairie landscape in north-central North Dakota. The AA. review the physical
basis of each flood type. This analysis will establish the magnitude of wetland flooding in comparison to terminal lake flooding in the study area. Stump Lake flooding is spatially restricted and has had limited impact upon the surrounding lakeshore
environment. Rural wetland flooding is pervasive and has a deleterious effect upon the region's agricultural economic base.
A GIS-based method for flooded area calculation and damage evaluation
Algorithm ; China ; Damage valuation ; Flood ; Geographical information system ; Natural hazards ; Water management ; Zhejiang
In this paper, a model for flooded area calculation and damage evaluation is presented. Flooding is divided into two types : source flood and non-source flood. The source-flood area calculation is based on seed spread algorithm. The flood damage
evaluation is calculated by overlaying the flooded area range with thematic maps and relating to other social and economic data. This model has been successfully used in the Zhejiang Province Comprehensive Water Management Information System developed
Rainfall-driven Episodic Flood Events : are they a major factor in moulding New South Wales arid land vegetation patterns ?
Arid area ; Australia ; Environmental management ; Flood ; New South Wales ; Over-grazing ; Precipitation ; Vegetation ; Vegetation dynamics
This paper reports the response of arid land plant species to high-rainfall-driven episodic flood events and how grazing pressure from native and introduced herbivores can impact on native species response. A systematic study was conducted
to understand the botanical composition in flooded and control areas on 25 m2 fenced and unfenced plots subjected to flooding and non-flooding. For 6 years following flooding, species richness in the flooded area was twice that of unflooded areas. In particular
, 27 native species from 13 families were recorded both in the enclosed and open plots located in the flooded area.
Neither precipitation nor discharge data from the Chenub and other headwater streams validates the oft-repeated assertion that flooding on the Gengetic plain has increased (even though flood damage has increased). - (DWG)
Impact of a flood on southern California riparian vegetation
Biodiversity ; Biogeography ; California ; Ecosystem ; Flood ; Impact ; Regression analysis ; Riparian vegetation ; United States of America
This study assesses flood impacts on riparian vegetation in two watersheds within the Transverse Ranges. Data collected in 1993 were compared to baseline data from 1990 to measure the effect of a 1992 flood.
Flood ; Flood control ; River basin ; Water retention
The paper discusses a broad range of flood control measures designed mainly to increase water retention capacity. It focuses on the main trends in flood control, i.e. on passive flood control and functions of dikes and retention basins. - (EN)
The article analyzes the causes, course and effect of the extreme flood in August 2002 in the Czech Republic. The analysis is stemming from meteorological and hydrological point of view and is framed by the broader context of historical experience
flooding and current flood protection and prevention system in the Czech Republic. - (EN)
Changing Late Holocene flooding frequencies on the Columbia River, Washington
Flood frequencies comparable to those of the twentieth century existed prior to 1020 A.D. and after 1390 A.D. Large floods were three to four times more common during the intervening centuries. Climatic conditions are the most probable factors
A case study on the residents response to the flood hazards and flood control measures in the inundated areas of Sapporo City
The structural modeling method is proposed in order to construct the consciousness structure of flood hazard problem and the living environment. A method using the AIC and a structural method of awareness movement are proposed. It is imperative