Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 2, pp. 103-121
Scale terrain statistics—orders, ranges, tributary distribution, orientation, age, scaling
1 Space Research Institute RAS, Moscow, Russia
Accepted: 15.03.2024
DOI: 10.21046/2070-7401-2024-21-2-103-121
The results of a long-term experimental study using a digital elevation model (DEM) of the properties of fluvial relief are presented. The scale of streams is usually characterized by the Horton order value. A more flexible method of division by scale, “range,” is proposed, in case where the interval of values of the catchment area is directly specified. For both options of watercourses grouping, laws called Horton’s laws have been found, which determine the number and density of watercourses of a certain scale. These laws work independently of the orders structure and can be written as homogeneous power laws with Horton exponents. From these laws, the following were analytically derived and experimentally tested: the principle and formulas for the distribution of watercourses of the same order among watercourses of higher orders; formula for the Tokunaga coefficient and formula for the catchment area of direct runoff. The difference base surfaces constructed from watercourses, which are selected by range and order, are similar. Using the LESSA (Lineament Extraction and Stripe Statistical Analysis) program made it possible to find the valley axes in the DEM and carry out their statistical analysis. The scale factor for valleys is their width. For the valley width, a correspondence with the catchment area has been established in the form of Horton’s law. The orientation characteristics and density of valleys and watercourses of the same scale are very similar. But with the help of the analysis of watercourses, it is possible to obtain results that are much more detailed in scale. It made it possible to clarify the scale at which an abrupt change in the orientation of relief elements occurs. To search for a formal correspondence between the scale of watercourses and their age, order dating scales found by researchers of three territories were compared. For one of the territories, the relationship between scale and age is presented in the form of Horton’s law. The scale invariance of relief properties manifested itself in the power-law nature of the laws, in the constancy of the total areas (catchment and valleys) and in the constancy of a number of characteristics measured in pixels.
Keywords: DTM, approximation, density of watercourse lines, catchment area, Horton’s laws, Horton’s exponent, scaling, valley age, valley orientation
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