with a mean of 1.13 ± 0.58 g l-1. This may have been due to the low and stable intensity of PP-type rainfall events, which resulted in enough topsoil compaction to prevent erosion.
As shown in Fig. 3b, events 990809 and 990828 were ML-type rainfall events, while the other four events (000707, 000811,
000817 and 000821) were IM-type rainfall events. Sediment hydrographs demonstrated that the sediment concentration was high at the beginning of the events, and then deceased logarithmically to levels of approximately 3.41 ± 4.13 g l-1. The initial high sediment concentration declined very quickly, after which the concentration stabilized. This pattern is similar to the description provided by Pathak et al. (2004), who explained that this phenomenon occurred due to the removal of loose soil particles on the soil surface during the early stages of runoff. However, as the process of erosion progresses, the runoff impacts the soil in deeper layers gradually. This eventually leads to the formation of large sized rills, after which the same amount of water washes away less soil. As a result, the sediment concentration decreases gradually, eventually reaching a relatively stable concentration until the end of the rainfall event. Based on these findings, it is likely that the process can be represented by the equation y = a ln x + b.
Events 000707, 000811, 000817 and 000821 correspond to type
IM-type rainfall events (Fig. 3c) and produced Type III sediment
with a mean of 1.13 ± 0.58 g l-1. This may have been due to the low and stable intensity of PP-type rainfall events, which resulted in enough topsoil compaction to prevent erosion.As shown in Fig. 3b, events 990809 and 990828 were ML-type rainfall events, while the other four events (000707, 000811,000817 and 000821) were IM-type rainfall events. Sediment hydrographs demonstrated that the sediment concentration was high at the beginning of the events, and then deceased logarithmically to levels of approximately 3.41 ± 4.13 g l-1. The initial high sediment concentration declined very quickly, after which the concentration stabilized. This pattern is similar to the description provided by Pathak et al. (2004), who explained that this phenomenon occurred due to the removal of loose soil particles on the soil surface during the early stages of runoff. However, as the process of erosion progresses, the runoff impacts the soil in deeper layers gradually. This eventually leads to the formation of large sized rills, after which the same amount of water washes away less soil. As a result, the sediment concentration decreases gradually, eventually reaching a relatively stable concentration until the end of the rainfall event. Based on these findings, it is likely that the process can be represented by the equation y = a ln x + b.Events 000707, 000811, 000817 and 000821 correspond to typeIM-type rainfall events (Fig. 3c) and produced Type III sediment
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