Automatic Association of Strahler’s Order and Attributes with the Drainage System

Abstract

Abstract-A typical drainage pattern is an arrangement of river segment in a drainage basin and has several contributing identifiable features such as leaf segments, intermediate segments and bifurcations. In studies related to morphological assessment of drainage pattern for estimating channel capacity, length, bifurcation ratio and contribution of segments to the main stream, association of order with the identified segment and creation of attribute repository plays a pivotal role. Strahler's (1952) proposed an ordering technique that categories the identified stream segments into different classes based on their significance and contribution to the drainage pattern. This work aims at implementation of procedures that efficiently associates order with the identified segments and creates a repository that stores the attributes and estimates of different segments automatically. Implementation of such techniques not only reduces both time and effort as compared to that of manual procedures, it also improves the confidence and reliability of the results.

The Impact of Soil and Water Conservation Measures on Base Flow Modification in the Northeastern Highland of Ethiopia

“…Amanuel and Degnu micro-catchments are part of the Yewel mount draining again to Megech River. Both study microcatchments have similar dendritic drainage patterns with 2nd-level stream order in Strahler's system [42].…”

“…In the first step of base flow separation-method selection, twelve web-based (Fixed Interval, Sliding Interval, Local Minimum, Lyne & Hollick, Chapman, Eckhardt, TR-55, Szilagyi, Boughton (AWBM 1993), Furey & Gupta, Chapman & Maxwell (1996) and Chapman & Maxwell) base flow separation methods were compared in Sep Hydro-software from the existing domains compared to select the method that best fits our data (collected from the two micro-catchments). Stream flow data at the driest time was taken as an actual value(control) in the process of selecting the best method for base separation from the stream hydrograph and was used [42] for base flow separation method comparison. The 12 base flow separation methods, mentioned above, were evaluated against the control with the criteria of base flow index (BFI) given by: BFI = 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 𝑏𝑏𝑇𝑇𝑏𝑏𝑏𝑏 𝑓𝑓𝑇𝑇𝑇𝑇𝑓𝑓 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 𝑆𝑆𝑇𝑇𝑆𝑆𝑏𝑏𝑇𝑇𝑆𝑆 𝑓𝑓𝑇𝑇𝑇𝑇𝑓𝑓 .…”