The main objective of this study was to evaluate various land-use input conditions in terms of the performance improvement found in consequent flow and sediment simulations. The soil and water assessment tool (SWAT) was applied to the Dakbla watershed from 2000 to 2018. After the calibration and validation processes, dissimilar effects between the input conditions on the flow and sediment simulations were confirmed. It was recognized that the impact of the land use on the sediment simulation was more sensitive than with the flow simulation. Additionally, through monthly evaluation, the effects against the flow and sediment in the rainy season were larger than those in the dry season, especially for sediment simulation in the last three months from October to December. Changing land-use conditions could improve flow and sediment simulation performance better than the performance found with static land-use conditions. Updated land-use inputs should be considered in simulations if the given land-use condition changes in a relatively short period because of frequent land-use policy changes by a local government.

中文翻译：

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越南中部高地达克拉河流域土地利用输入条件对流量和泥沙排放的影响

这项研究的主要目的是根据随后的流量和沉积物模拟中发现的性能改进来评估各种土地利用输入条件。从2000年到2018年，将土壤和水评估工具（SWAT）应用于达克布拉流域。在进行校准和验证过程之后，确认了输入条件对流量和沉积物模拟的不同影响。人们已经认识到，土地利用对沉积物模拟的影响比流动模拟更为敏感。此外，通过每月评估，雨季对水流和泥沙的影响要比旱季大，尤其是在10月至12月的最后三个月的泥沙模拟中。与静态土地使用条件相比，改变土地使用条件可以更好地改善水流和泥沙模拟性能。如果给定的土地使用状况由于地方政府频繁更改土地使用政策而在相对较短的时间内发生变化，则应在模拟中考虑更新的土地使用投入。