Extraction of tectonic imprints using geospatial techniques:Evidence from Mandakini River basin,Uttarakhand,India  

作　　者：Atul Kumar PATIDAR Girish Ch.KOTHYARI Manmohan KAUSHIK Sushil KHANDURI 

机构地区：[1]Department of Petroleum Engineering and Earth Sciences,UPES,Dehradun 248007,India [2]KainGeotech Consultancy,Dehradun 248007,India

出　　处：《Journal of Mountain Science》2024年第11期3720-3738,共19页山地科学学报（英文）

基　　金：The authors are thankful to the UPES,Dehradun and the Department of Science and Technology,Govt of India(Project:CRG/2023/000555)for supporting this study.

摘　　要：The existing literature discussed only the aerial aspect and provided a brief description of tectonic-geomorphic correlation with field evidence.In present study we applied power law equations to estimate basin asymmetry factor(AF),Transverse topographic asymmetric factor(T),Hypsometric Integral(HI),longitudinal profile,stream length gradient index(SL),steepness index(Ksn),Chi(χ),and knick point(Kp)analysis to examine the response of tectono-climatic fluctuations in the Mandakini River basin,central Uttarakhand Himalaya.To decouple the causative tectono-climatic factors,we employed geospatial and Stream Power Incision Modeling(SPIM)techniques.SPIM is a globally accepted tool to predict an equilibrium state between fluvial erosion rates and the escalating function of stream power.It is actively applied in modeling the transformation of river systems especially in rugged topographic regions.The present study covers SPIM-based morphometric assessment of the tectonically sensitive Mandakini River basin between Ramgarh Thrust(RT)and Vaikrita Thrust(VT)in the central region of Uttarakhand Himalaya.In the upper reaches of the basin,U-shaped glaciated valleys dominate the landscape,while a rolling topography and deeply incised narrow valleys are depicted towards the downstream.Therefore,to understand the response of active tectonic over geomorphology,the drainage basin has been divided into two separate zones from the confluence point near the Rampur area.The modeling outcomes indicate that the Mandakini drainage basin is in a disequilibrium state where channels are actively incising to bedrock.Overall,AF of 32 and 70 indicate leftward tilting in the upper reaches and rightward tilting in the lower reaches of the basin,respectively.The HI value of 0.38 indicates a stage of maturity,characterized by a concave shape profile.Based on the analysis it may be concluded that the fragile lithology and tectono-climatic fluctuations are dominantly controlling the topography and valley floor morphology of the Mandakini River.

关 键 词：Stream Power Incision Model(SPIM) Transverse Topographic Asymmetry Factor(T) Knick points Hypsometric curve Mandakini River Garhwal Himalaya 

分 类 号：P208[天文地球—地图制图学与地理信息工程] P548[天文地球—测绘科学与技术] P931.1