Methodology adopted for computations of morphometric parameters (modified after Masoud 2016)
| Parameter . | Formula . | Reference . |
|---|---|---|
| The basin dimensions category | ||
| Area (A) | ArcHydro analysis | Schumn (1956) |
| Perimeter (P) | ArcHydro analysis | Schumn (1956) |
| Length (Lb) | ArcHydro analysis | Schumn (1956) |
| Width (W) | ArcHydro analysis | Schumn (1956) |
| The basin shape category | ||
| Circulation ratio (Cr) | 4πA/P | Miller (1953) |
| Elongation ratio (Er) | 1.128 × A0.5/Lb | Schumn (1956) |
| Shape factor (Sf) | Lb2/A | Horton (1932) |
| The basin surface category | ||
| Relief ratio (Rr) | R/Lb | Schumn (1956) |
| Relative relief ratio (RV) | R/P | Melton (1957) |
| Ruggedness index (RI) | R×D | Schumn (1956) |
| Hypsometric index (HI) | (Emean – Emin)/ (Emax – Emin) | Pike & Wilson (1971) |
| The drainage network category | ||
| Total stream length (TSL) | GIS software analysis | Horton (1945) |
| Total stream number (TSN) | GIS software analysis | Strahler (1952) |
| Stream order (SrO) | Hierarchial rank | Strahler (1964) |
| Texture ratio (Tr) | TSN/P | Horton (1945) |
| Drainage density (D) | TSL/A | Horton (1945) |
| Stream frequency (Fq) | TSN/A | Horton (1945) |
| Bifurcation ratio (Br) | Nu/Nu+1 | Schumn (1956) |
| Parameter . | Formula . | Reference . |
|---|---|---|
| The basin dimensions category | ||
| Area (A) | ArcHydro analysis | Schumn (1956) |
| Perimeter (P) | ArcHydro analysis | Schumn (1956) |
| Length (Lb) | ArcHydro analysis | Schumn (1956) |
| Width (W) | ArcHydro analysis | Schumn (1956) |
| The basin shape category | ||
| Circulation ratio (Cr) | 4πA/P | Miller (1953) |
| Elongation ratio (Er) | 1.128 × A0.5/Lb | Schumn (1956) |
| Shape factor (Sf) | Lb2/A | Horton (1932) |
| The basin surface category | ||
| Relief ratio (Rr) | R/Lb | Schumn (1956) |
| Relative relief ratio (RV) | R/P | Melton (1957) |
| Ruggedness index (RI) | R×D | Schumn (1956) |
| Hypsometric index (HI) | (Emean – Emin)/ (Emax – Emin) | Pike & Wilson (1971) |
| The drainage network category | ||
| Total stream length (TSL) | GIS software analysis | Horton (1945) |
| Total stream number (TSN) | GIS software analysis | Strahler (1952) |
| Stream order (SrO) | Hierarchial rank | Strahler (1964) |
| Texture ratio (Tr) | TSN/P | Horton (1945) |
| Drainage density (D) | TSL/A | Horton (1945) |
| Stream frequency (Fq) | TSN/A | Horton (1945) |
| Bifurcation ratio (Br) | Nu/Nu+1 | Schumn (1956) |
Note:R is the relief, E is the elevation in km, Nu is the total number of stream segments in order u, and Nu+1 is the total number of segments of the next higher order.