## 4 Results
### Types and Characteristics of Sedimentary Environment
#### 4.1.3 DFS Sedimentary Environment  
The structural pattern and climatic conditions of the three sides of the Ebinur Lake Basin have formed a large-scale DFS sedimentary environment around the basin, which has developed from the front of the mountains on the edge to the center of the basin, accounting for 83.78% of the basin. The melting of snow on the southern and western mountain tops provides a stable water source for some rivers. With the continuous development of rivers, the expansion of diversion channels, and the leakage of groundwater, a large number of branch rivers have been formed. The northern Zaire Mountains are close to the Ebinur Lake, the sedimentary center of the basin, and the gradient is steep. The rapid growth of river runoff during the flood period leads to the bifurcation of levee. According to the DFS classification scheme of [PERSON] et al. [32], the DFS system in this area is divided into three types: (1) Micro DFS, which is further divided into two types--with backbone river and revers. The micro DFS without a main river has a radius of less than 10 km, an area of less than 10 km\({}^{2}\), and a gradient of more than 1.0\({}^{\circ}\) (Figure 6a); the geometry of micro DFS with main rivers is mainly fan-shaped, with a radius of 10-30 km, an area of 10-500 km\({}^{2}\), and a gradient of 0.8-2\({}^{\circ}\) (Figure 6b). (2) Large-scale DFS, with a radius of 30-100 km, an area of 100-2000 km\({}^{2}\), and a gradient of 0.3-2\({}^{\circ}\) (Figure 6c); (3) Macro DFS, radius greater than 100 km, the area more than 1000 km\({}^{2}\), gradient less than 0.3\({}^{\circ}\) (Figure 6d). A total of 121 branch river sedimentary systems were developed in the Ebinur Lake Basin, including one macro DFS, four mega DFS, and 116 micro DFS, including 48 micro DFS with trunk rivers and 68 micro DFS without trunk rivers. The micro DFS with the main channel is concentrated in the front of the mountain, and the terrain is steep. It is concave from the top to the end, and it is low on both sides of the convex in the horizontal direction. The main channel is mainly braided river, and the distal end may develop a short-range meandering river. In addition, a large number of braided river channels have developed in the whole sedimentary system (Figure 7), \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Morphological Type** & **Wave Length (m)** & **Wave Width (m)** & **Wave Height (m)** \\ \hline Minimum value & 45 & 63 & 1 \\ \hline Maximum value & 738 & 922 & 54 \\ \hline Average value & 199 & 289 & 10 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Morphological characteristics of dune sedimentary system. Figure 6: DFS types and their main characteristics in the Ebinur Lake Basin. 2024. (The basic map comes from Google Earth satellite images). most of which are straight gravel river channels. The sediments between the distributary channels are mainly sandy gravel, less muddy sediments, while the gravel beaches are widely developed. The flow of the river channel is affected by seasonality, and some of the continuous river flow can be seen. Most of the river channels are temporary channels, mainly due to debris flow deposits. The vegetation is sparsely developed, with mainly drought-resistant plants, mainly growing in the river edge area. The micro DFS without a main channel is developed in the steep area of the piedmont or between DFS. It is mainly composed of gravity flow deposits, without an obvious main channel. A large number of temporary gravel braided channels are distributed on the surface. The channel is dispersed from the near end to the far end (Figure 7), and the distance between adjacent channels gradually increases. The main sediments of this type of DFS are gravel, with a small amount of sand and mud, and almost no vegetation. Through the observation of satellite images, the micro DFS of non-trunk channels includes two types: inverted cone shape and fan shape.