Application of flood index in monitoring Flood-plain ecosystems (by the example of the Middle Ob flood-plain)

Abstract

The concept of regional hydroecological monitoring has been developed for the flood-plain of the Middle Ob. Its object is to control the state of flood-plain ecosystem productivity for organization of scientific, regional-adopted and ecologically regulated nature management. For this purpose hydroecological zoning of flood-plain territory performed, the most representative stations of water-gauge observations for each flood-plain zone organized, the scheme of flood-plain flooding was prepared. On the basis of observations within more than 50_years flood hydrographs were composed, the part which forms the flood influence was calculated. It was presented through the complex factor - index of flood influence. The graphs of the flood influence index changes at reference water stations from 1935 to 2000 were presented.