Morphometric analysis and sub-watersheds prioritization of Nagmati River watershed, Kutch District, Gujarat using GIS based approach

• Autorzy: Said S. , Siddique R. , Shakeel M.

Identyfikatory

DOI

10.2478/jwld-2018-0068

Warianty tytułu

PL

Analiza morfometryczna i ustalanie priorytetów dla zlewni rzeki Nagmati, dystryktu Kutch w prowincji Gujarat na podstawie GIS

• Języki publikacji: EN

Abstrakty

EN

Morphometric analysis of any watershed and its prioritization is one of the important aspects of planning for implementation of management programmes. Present study evaluates the quantitative morphometric characteristics of Nagmati River watershed in Kutch District of Gujarat by utilizing Cartosat-1 data (CartoDEM). In all 19 aerial and 6 linear morphometric parameters of the watershed have been evaluated. Drainage map of the study area reveals a dendritic drainage pattern with sixth order stream network comprising 492 numbers of streams and confining an area of 129.41 km². Mean bifurcation ratio (R_b) and stream length ratio (R_L) of the watershed evaluated are 3.44 and 0.54 respectively which corroborates the fact that drainage pattern is not influenced by the geological evolutions and disturbances in the recent past. The drainage density of 2.68 km∙km^–2 indicates impermeable subsoil material with sparse vegetation and moderate to low relief. Elongation ratio of 0.956 infers the basin to be closer to a circular shape. The geologic stage of development and erosion proneness of the watershed is quantified by hypsometric integral (HI) bearing value as 0.5, indicating the landscape to be uniform and in early mature stage. The study prioritizes eight sub-watersheds as high, medium and low for taking up soil and water conservation activities. Hence, remote sensing applications proved to be highly useful in extracting the precise data for the evaluation and analysis of watershed characteristics.

PL

Analiza morfometryczna dowolnej zlewni i ustalanie dla niej priorytetów jest jednym z aspektów planowania podczas wdrażania programów zarządzania zlewnią. W prezentowanych badaniach dokonano oceny ilościowych cech morfometrycznych zlewni rzeki Nagmati w dystrykcie Kutch, prowincja Gujarat, wykorzystując dane Cartosat-1 (CartoDem). Oceniono łącznie 19 powierzchniowych i 6 liniowych parametrów morfometrycznych tej zlewni. Na podstawie mapy obszaru badań można mówić o dendrytowym charakterze drenażu z siecią strumieni szóstego rzędu obejmującą 492 strumienie i pokrywającą obszar 129,41 km². Średni stosunek bifurkacji (R_b) i stosunek długości strumieni (R_L) w zlewni wynoszą odpowiednio 3,44 i 0,54, co potwierdza fakt, że na układ zlewni nie mają wpływu zmiany geologiczne czy zaburzenia w nieodległej przeszłości. Zagęszczenie drenażu równe 2,68 km∙km^–2 wskazuje na nieprzepuszczalny materiał podglebia z rzadką roślinnością i urzeźbieniem terenu od umiarkowanego do niewielkiego. Współczynnik wydłużenia 0,956 pozwala wnioskować, że basen ma kształt zbliżony do koła. Geologiczny stan rozwoju i podatność zlewni na erozję wyrażone ilościowo całką hipsometryczną o wartości 0,5 wskazują, że krajobraz jest jednorodny i znajduje się we wczesnym stadium dojrzałości. W badaniach ustalono priorytety dla ośmiu pod-zlewni, nadając priorytet wysoki, średni i niski ze względu na ochronę gleb i wody. Zastosowanie teledetekcji okazało się przydatne w pozyskiwaniu dokładnych danych do oceny i analizy cech zlewni.

Słowa kluczowe

EN

hypsometric analysis; morphometric analysis; Nagmati watershed prioritization

PL

analiza hipsometryczna; analiza morfometryczna; priorytety dla zlewni Nagmati

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2018
• Tom: no. 39
• Strony: 131--139
• Opis fizyczny: Bibliogr. 29 poz., rys., tab.

Twórcy

autor

Said S.

• Aligarh Muslim University (AMU), Civil Engineering Department, 202002 Aligarh, India

autor

Siddique R.

• Jamia Millia Islamia University, Civil Engineering Department, New Delhi, India

autor

Shakeel M.

• Jamia Millia Islamia University, Civil Engineering Department, New Delhi, India

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