Hydrologic Regime

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hydrologic Regime


changes with time in the rates of flow of rivers and in the levels and volumes of water in rivers, lakes, reservoirs, and marshes. The hydrologic regime is closely related to seasonal changes in climate. In regions with a warm climate, the hydrologic regime is affected mainly by atmospheric precipitation and evaporation; in regions with a cold or temperate climate, the air temperature is a leading factor.

The hydrologic regime of rivers manifests itself by daily, ten-day, monthly, seasonal, and long-term fluctuations. It consists of a number of characteristic periods (phases) that vary with seasonal changes in the conditions under which rivers are fed. These phases are known as high water, freshet, and low water. Rivers are fed unevenly in the course of a year because of varying amounts of precipitation and uneven melting of snow and ice and entry of their water into the rivers. The fluctuations observed in the water level are caused mainly by changes in the flow rate and by the effects of wind, ice, and man’s economic activities.

The hydrologic regime of lakes is determined by the relationship between the amount of precipitation reaching the lake’s surface, evaporation, surface and underground flow into the lake, and surface and underground outflow of water from the lake, as well as by the size and shape of the lake, the pattern of change in the surface area with change in level, and wind activity, which determines the size of the waves and the extent to which the level rises and falls. Fluctuations in the lake level may be seasonal, annual, or short-term.

The hydrologic regime of marshes is dependent on climatic and hydrologic conditions, terrain, and the nature of the vegetation. Man’s economic activities are introducing ever greater changes in the hydrologic regime.


Chebotarev, A. I. Obshchaia gidrologiia (vody sushi). Leningrad, 1960.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
It was also anticipated that a changing hydrologic regime would persist for several years after land disturbance before assuming characteristics more indicative of natural seasonal variations and not the lingering effects of land disturbance.
In fact, the nature of the hydrologic regime in the study area makes it possible for the groundwater recharge area to be quite distant from the well location.
Within a given physiographic region, wet and dry sites were chosen within 4 km of each other to reduce seedling variation due to factors other than maternal hydrologic regime. Seeds were collected from three trees (half-sib families) per site.
Channelization profoundly altered the hydrologic regime of the river, with severe consequences for plants and animals dependent on river, wetland, and floodplain habitat (National Research Council, 1992).
Left unchecked, this downhole flow can severely disturb the natural thermal, chemical, and hydrologic regime, thus rendering observations in the borehole meaningless.
Attendees learn the importance of incorporating LID concepts and principles into the planning process, a variety of techniques for mimicking the predevelopment hydrologic regime of the land, and retrofit methods that can he applied to highly urbanized environments.
When designing and constructing a wetland or stream, soil properties must be considered in response to the anticipated hydrologic regime. Soil characteristics that must be contemplated include texture, organic matter, pore space, and chemical properties such as pH.
-- Altering the hydrologic regime of a wetland forest may result in changes in tree growth, as hydrology is a primary factor influencing the growth of wetland trees.
Stream reaches were selected to represent the many combinations of riparian vegetation, stream morphology, and hydrologic regime found across California's diverse rangeland watersheds.
Sparks, "Risks of altering the hydrologic regime of large rivers," in Predicting Ecosystem Risk, J.

Full browser ?