English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The subtropics within the monsoonal range are distinguished by seasonal rainfall and intensive human activity affecting stream water chemistry. This paper aims to determine spatio-temporal variations of stream water chemical elements in anthropogenically modified catchment located in the area with highest annual rainfall at global scale. The study was conducted in the Umiew catchment (493.7 km) on the southern slope of the Meghalaya Plateau in Northeast India. The area encompasses two typical landforms with different land use of the southern slope: the grass covered hilly plateau with high population density and the forested deep canyon. The upper part of the Umiew catchment is built up of crystalline rocks that are covered by horizontally bedded sandstones and limestones in the lower part. The water sampling was conducted along the Umiew river in six sites during winter (baseflow) and monsoon season (fastflow) in 2014-2015. Numerous physico-chemical parameters were measured, including temperature, pH, electrical conductivity (EC), dissolved organic carbon (DOC) and major ions. Chemical element concentrations were found to be low, with a total dissolved load (TDS) below 100 mg L. The facies pattern change from Na-HCO3 in the upper part to Ca-HCO3 at the catchment outlet. Naturally low concentrations of chemical elements and very small seasonal differences associated with weathered bedrock, leached soils as well as forest vegetation. Human activity increases the spatial and temporal variation in the concentrations of chemical elements. In effect, water chemistry exhibited strongest control of anthropogenic impact in densely populated built-up areas in the upper part of the catchment. Low ion concentrations in the middle part of the catchment with deep forested canyon are a result of the crystalline deep weathered bedrock, high rainfall and forest vegetation. High ion concentrations at the river outlet are effect of intensive carbonate rocks weathering.

WATER CHEMISTRY IN THE CATCHMENT WITH HIGHEST RAINFALL AT GLOBAL SCALE AND INTENSIVE HUMAN ACTIVITY (NORTHEAST INDIA)