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GIS-based geomorphometric analysis for potential applications in reversing land and biosystem degradation

journal contribution
posted on 07.10.2020, 00:00 by PK Langat, L Kumar, Richard KoechRichard Koech
Watershed morphometric assessment is about measurements and calculations of land surface forms for the purpose of understanding hydro-geomorphological character and patterns. Important natural environment geo-information and summary of the spatial characteristics of Tana River Basin (TRB) in Kenya have been obtained through hydro-geomorphometric analysis. Advanced Spaceborne Thermal Emission and Reflection Radiometer Digital Elevation Model (ASTERDEM) data and ArcGIS (ESRI Inc., version 10.4.1) together with published mathematical equations were applied to extract morphometric parameters of the drainage basin, which covers a total area of 94,930 km2 and a span of 527.75 km. The quantitative morphometric analysis considered a total of 28 relief, areal, and linear hydromorphometric characteristics of the TRB. Relief parameters of the basin suggest moderate-to-low overall watershed steepness, upland with rolling land surface patterns, rugged landforms susceptible to erosion and sediment transportation, and a landscape in evolution process tending towards maturity. This means stability of the land surface can be attained with intensive land degradation reversing strategies like erosion control measures. Areal characteristics further support the basin’s susceptibility to erosion as shown by stream length, stream drainage density, and circulatory ratio values. Also, the areal aspects portray peak runoffs with short duration flashes. Linear parameter value results such as bifurcation ratio imply that infiltration capacity varies with stream orders across the watershed. This hydro-geomorphometric analysis would be useful to land and water managers, researchers and practitioners of TRB, and other similar systems in designing and planning soil and water conservation and management practices such as soil erosion control, groundwater recharge activities, catchment modelling, runoff and flood studies, prospecting groundwater mapping, and biological applications. Keywords Stream network . Tana River watershed . Drainage density . Soil erosion . ASTERDEM. Morphometric analysis

History

Volume

192

Issue

10

Start Page

1

End Page

14

Number of Pages

14

eISSN

1573-2959

ISSN

0167-6369

Publisher

Springer Science and Business Media LLC

Language

en

Peer Reviewed

Yes

Open Access

No

Acceptance Date

24/09/2020

External Author Affiliations

University New England

Era Eligible

Yes

Journal

Environmental Monitoring and Assessment