Applied methodology based on HEC-HMS for reservoir filling estimation due to soil erosion

Abstract

Authors propose a beneficial methodology for hydrological planning in their study. Prospective evaluations of the basins’ net capacity can be done using the technique presented. The HEC-HMS (Hydrologic Modelling System) software can be used to estimate in a basin, the sediment emitted. For a certain precipitation, this methodology allows estimating, within a certain range, the gradual blockage of a reservoir, and even a projected date for total blockage. This has some applications to adopt corrective measures that prevent or delay the planned blockage deadlines. The model is of the semi-distributed type, estimating the generation and emission of sediments by sub-basins. The integration of different return periods in HEC-HMS with a semi-distributed model by sub-basins and the application of a mathematical model are the differentiating element of this research. The novelty of this work is to allow prognosing the reservoir sedimentation rate of basins in a local and regional scale with a medium and large temporary framework. The developed methodology allows public institutions to take decisions concerning hydrological planning. It has been applied to the case of “Charco Redondo” reservoir, in Cádiz, Andalusia, in southern Spain. Applying the methodology to this case, an average soil degradation of the reservoir basin has been estimated. Therefore, it is verified that in 50 years the reservoir is expected to lose 8.4% of its capacity.

Sensitivity Analysis in Mean Annual Sediment Yield Modeling with Respect to Rainfall Probability Distribution Functions

“…Figure 2 shows the operations and its organic relationships. The basic information that is required includes the rainfall dataset [39], the digital terrain model of the basin (DMT), thematic maps (geology, vegetation and slopes) [40,41], detailed information on soil textures by sub-basins, drainage systems, including sub-basins, and flow routing reaches [24]. The selection of the study area is based on previous knowledge regarding its particular idiosyncrasy.…”

“…The catchment presents a problem related to the presence of medium-elevated erodible soils. This study uses the results of the application of a MUSLE-based model in the selected basin as basic information [24]. It is important to emphasize that, given the specific objective of this research, the calibration or validation of this model is out of the scope of this study.…”

“…Among these models, the formulation of García and Robredo [23] for torrential basins should be highlighted, as it is one of the first known formulations. In the field of hydrological engineering, with specific assigned probabilities and restricted to certain T, a formulation can be found for catchments in southern Spain [24]. In any case, both intrinsically to the MUSLE model and implicitly in statistical models, rainfall and runoff are the agents that cause erosion and subsequent emission of sediments [25,26].…”

Soil Erosion Assessment and Early Warning Model Based on Big Data and Artificial Intelligence

“…2) Terrain factor Topographic factor, as a key expression factor of local natural environment, provides a comprehensive description of basic landform types and topographic relief. Terrain diversity has a profound impact on all aspects of the entire ecological environment, such as plant growth, animal survival and climate change [15]. This is because the terrain is not only directly related to soil, water and light conditions, but also indirectly affects the migration and reproduction of organisms, as well as the formation and change of climate.…”

Similarity Model Test on Rainfall Scouring Mechanism of High-Speed Railway Subgrade Slope

“…The above artificial or natural rainfall experiments have been used to analyze the occurrence and development process of roadbed slope erosion, mainly based on qualitative description, with less quantitative analysis. In addition, combining indicators such as flow velocity, incipient particle size and scouring erosion amount is beneficial for revealing the scouring erosion mechanism and quantitatively characterizing the scouring erosion law for railway roadbed slopes [19]. Model tests are commonly used to study slope instability [17,20].…”