According to the analysis of terrain attributes, using the DSM obtained by drone to conduct a mountainous urban fluvial flood modelling, the resolution of the DSM used should be kept within 1 m to 5 m. However, if larger mountainous cities were involved, in the case of non-extreme discharges, considering the cost of processing, using a resolution of 5 m to 10 m could also meet requirements in terms of inundation area drawing, but there could be a possibility of overestimation of flood depth.

The main objective of this work is to discuss the cumulative effects on flow regime with the construction of cascade reservoirs. A revised IHA (indicators of hydrologic alteration) method was developed by using a projection pursuit method based on the real-coded accelerated genetic algorithm in this study. Through this method, IHA parameters with a high contribution to hydrological-alteration evaluation could be selected out and given high weight to reduce the redundancy among the IHA metrics.

In the mid-1990s, the losses caused by ecological environment destruction every year in China accounted for more than 8 % of GDP. When economic prosperity comes with serious environmental damage, the false image of national growth emerges, which will cause distortion to the evaluation of water resources carrying capacity. This paper proposes a quantitative technical route combined with a water resources balance sheet, which is able to fully reflect the sustainable development theory.

Land use changes alter the hydrological characteristics of the land surface, and have significant impacts on hydrological cycle and water balance, the analysis of complex effects on natural systems has become one of the main concerns. We use different indicators to evaluate changes in land use and establish statistical models for rainfall and runoff. The results show that the predicted runoff is lower than the measured runoff. Eecological protection measures should be strengthened.