Classification of drainage network types in the arid and semi-arid regions of Arizona and California
Section snippets
Introduction and review
The occurrence of drainage networks in different regions depends on local physiographic and climatic characteristics which produce specific attributes that define the network structure and impact the basin's hydrologic response (Berger and Entekhabi, 2001). Classification systems have been developed to distinguish various channel network types including dendritic, parallel, and pinnate networks (Zernitz, 1932, Parvis, 1950, Howard, 1967, Phillips and Schumm, 1987, Mejia and Niemann, 2008). A
Data set
Twenty washes represented by intermittent streams with erodible surfaces were randomly selected in the arid and semi-arid regions of the USA. Google Earth with a topomaps tool was used to identify the washes and their elevations. Fig. 2 illustrates the outlets of the 20 washes (diamonds) and the counties limits (lines) in Arizona and California.
The washes are located in Arizona and California, USA, and their locations and basin sizes are presented in Table 1. The basin sizes range from 5 to
Computation of the preexisting surface slope
The procedure for identification of the preexisting surfaces follows Jung et al. (2011) and is briefly described herein. Two main thresholds are required to estimate the slope of preexisting surfaces, which can be considered as regions relatively unaffected by modern fluvial processes (Jung et al., 2011). For the first threshold, the smallest drainage area altered by hillslope processes in the network is used for estimating channel head locations to avoid including large drainage areas which
Slope of preexisting surfaces
The slopes of preexisting surfaces for the 20 washes described in the data set section are estimated to identify the conditions for the occurrence of drainage networks in arid and semi-arid regions. The basins of the 20 washes of the region of study include a larger proportion of preexisting surfaces than was observed for river basins in non-arid regions of the USA (see Jung et al., 2011). For instance, the proportions of preexisting surfaces for a dendritic network and a parallel network in
Discussion
The analysis of 20 wash networks in the arid and semi-arid regions of Arizona and California is performed to identify the preexisting slopes of the networks. All the wash networks studied in the present paper show small preexisting slopes below 3%. This might be because arid environments affect the characterization of the slopes of preexisting surfaces in the washes featured by erodible surfaces.
We also examined the classification of drainage network types for the 20 wash networks based on
Conclusions
The main objectives of the present research are to identify channel network types in the arid and semi-arid regions of the USA and investigate the occurrence of pinnate networks by using three measures derived from scaling invariance. These measures are the drainage area increment, the channel course irregularity, and the tributary junction angle. The preexisting topographic slope is also examined to determine whether it influences the occurrence of different types of drainage networks in the
Acknowledgements
The authors are grateful to the Associate Editor and to the anonymous reviewer for their comments which greatly helped improve the quality of the manuscript. This research was supported by a grant(14AWMP-B082564-01) from Advanced Water Management Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government.
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