The Geomorphology, Global Climatic Change and Civil Engineering Works at the Flooding Areas of the Northeast of Argentina

摘要

The Argentine Northeast with more than 300. 000 km2 constitute in its main area, excepting the Misiones province (about of 29. 500 km2), a very typical large plain significantly flat. It is located over a sedimentary basin which begun its development at the early Paleozoic Era. The Northeast plain is cut by several fluvial courses. Some of these rivers coming from neighboring areas from the so-called Height Parana Fluvial Basin (Brazil country). The geomorphologic and the hidrometrical conditions outlined the large flooding recurrence. The mentioned flooding impact over thousands of square kilometers. On the other hand, the flooding acted negatively over hundred of thousands civil people. Lately, it is apparent that from the 60's these phenomena have been increase and repeated with more frequency. This, of course, implies many damages and production loosed, especially at the urban zones. The costs are always in the order of several million dollars. It is seems that the zone is changing to a more wet condition in which anthropoid action acts as a catalyzing phenomenon. These not promising pictures imply the need to have in consideration these factors in future civil engineering works. The aim of this paper is to show geomorphology of the region acts over the flooding and led to elaborate futures "scenarios". This is in the case that the above mentioned picture do not change in the next decades. Also, the aims of this paper is to show how the paleogeomorphology may predict the possible behavior and fix rulers for projects and constructions of civil engineering work to protect from flooding in the plain areas caused mainly by the Parana river. This large river, in the most extended flooding of this century produced a water volume of about 60. 000 m~3/seg in front of the Corrientes city.