Landslides is one ofthe most severe hazard in Vietnam, arnong that a major number of landslides are induced by heavy rainfall The paper deals with heavy rainfall induces shallow landslides at the excavated slopes in Bac Kan province and at the natural slopes in Binh Dinh province. Landslides in Bac Kan can happen when the amount ofrainfall is 180tmn continuously. Landslides of natural slopes in Binh Dinh can only occur when rainfall makes the slopes ahnost saturated. This can happen when the arnouut of rainfall reach over 1260mm.
Global warming is the rising average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Since the early 20th century, Earth's average surface temperature has increased by about 0.8 °C, with about two thirds of the increase occurring since 1980. Warming of the climate system is unequivocal, and scientists are more than 90% certain that most of it is caused by increasing concentrations of greenhouse gases produced by human activities such as deforestation and the burning of fossil fuels.
Every year, the damages, caused by the natural disasters such as heavy rainfalls, floods and doughts ..., take lives and destroy properties in many parts of the world. In water resources engineering, frequency analysis is one of the statistical techniques applied by hydrologists to try and estimate the probabilities associated with design events.
Information about climate1 is used to make decisions every day. From farmers deciding
which crops to plant next season to mayors in large cities deciding how to prepare for future heat
waves, and from an insurance company assessing future flood risks to a national security planner
assessing future conflict risks from the impacts of drought, users of climate information span a
vast array of sectors in both the public and private spheres. Each of these communities has
different needs for climate data, with different time horizons (see Box 1) and different tolerances
The most discussed effect of global warming is the increase of temperatures,
although this increase will not be homogeneous through the seasons, with the winters
expected to warm up significantly more than the summers. In addition, changes in
precipitation are also expected that could lead to increase or decrease of rainfall, snowfall
and other water-related events. Finally, a change in the frequency and intensity of storm
events could be possible, although this is probably the most uncertain of the effects of
Land clearing is expected to be done mechanically, the technique being similar to that
at present used by CAMDEV for rubber. Trees are pushed over, raked into windrows
and burnt. On the Boa Plain an effective burn wil l be essential to facilitate drain
excavation. This may be difficul t with the heavy rainfalls and short dry season. The
timing of the clearing operations wil l be important. Felling one dry season and wind-
rowing and burning the next may help, as may the use of flame-throwing equipment
and fans to ignite the windrowed debris properly. Some pre-clearing drainage may also...
Research objectives: To find scientific solutions for urban drainage issues and to improve river and pipe hydraulic coupling model for suitable urban application under specific conditions of strong tidal impact, heavy rainfall and rapid urbanization in Viet Nam.
Objectives of research: 1) To explore mechanism of the seasonal moisture transport in Vietnam. 2) To determine the relationship between the moisture transport and the ENSO event, especially in ENSO years which heavy rainfall or severe drought occurred in Vietnam. 3) To propose the application of the moisture transport information for monitoring droughts (during El Niño) and heavy rainfall (during La Niña) over Vietnam.
The papers present the results of study on application of rainfall-runoff, channel routing models for improvement and extending forecast lead time and Diffusion Hydrodynamic Model (DHM) for inundation warning of Tra Khuc and Ve river basins. Keywords: Time of concentration Tc, update of forecast errors, flood forecast, inundation warning.
1. Introduction∗ For river basins in the central coastal provinces, the rivers has steep terrain, plains adjacent to the sea are relatively flat, so every year, floods and flash floods caused heavy damage to persons and property of people in the areas.
Drainage wil l be of crucial importance to the success of the development proposals for
the Boa Plain. Flooding is caused by a combination of heavy local rainfall and overflow
from the rivers that flow across the plain. A separate drainage strategy is needed for the
northern sector between the two largest rivers, the Meme and Mokoko, where floods,
particularly from the former, are much larger and last longer than elsewhere. In this
sector a number of major drains leading west, by the most direct route to the sea, wil l
be required — with some remodelling of the Mokoko...