Modelling the Impact of Land Cover Changes on Flood Mitigation in the Upper Lužnice Basin

Abstract

The study presented herein investigates the impact of simulated changes in land cover on rainfall-runoff conditions for the transboundary basin of the upper Lužnice. The HEC-HMS hydrological model was chosen for these simulations. Scenario models were used to simulate the impact of modifications in basin land cover with individual scenarios reflecting ground cover changes. The years 1990 and 2000, which are available in the CORINE Landcover database, were chosen as variants of river basin land cover. In addition, two theoretical versions of possible extreme variants in fundamental land cover changes -the conversion from agricultural land to grassland and the forestation of the river basin, with the exception of roads and bodies of water -were also included.Single day rainfall totals with a recurrence period of 10, 20, 50 and 100 years were selected to calculate the volume of runoff and culmination discharge. These results demonstrate a clear decrease in the degree of impact of land cover structure on runoff conditions, increasing with the magnitude of precipitation. Článek představuje výsledky simulace vlivu zm n krajinného krytu na srážko-odtokové pom ry v přes-hraničním povodí horní Lužnice. Pro modelování byl vybrán hydrologický model HEC-HMS. K modelování vlivu zm n krajinného pokryvu povodí byla použita metoda scénářového modelování, kde se v jednotlivých scénářích m ní krajinný pokryv. Jako varianty krajinného pokryvu povodí byly zvoleny roky 1990 a 2000, pro které je k dispozici databáze CORINE Landcover, a dále dv teoretické krajní varianty možných variant zm n struktury krajinného krytu -zatravn ní zem d lské půdy a zalesn ní povodí krom intravilánů, komunikací a vodních ploch.Pro výpočet objemů odtoků a kulminačních průtoků byly vybrány jednodenní návrhové srážkové úhrny s pravd podobností opakování 10, 20, 50 a 100 let. Z výsledků simulace je zřejmý pokles vlivu struktury krajinného pokryvu na odtokové pom ry se vzrůstající extremitou srážky.

Estimation of CN Parameter for Small Agricultural Watersheds Using Asymptotic Functions

“…It is straightforward and easy to apply. A primary reason for its wide applicability and acceptability is the fact that it accounts for major runoff generating watershed characteristics, namely soil type, land use/treatment, surface conditions and antecedent moisture conditions (AMC) [4,[25][26][27][28][29].…”

Applicability of a Nu-Support Vector Regression Model for the Completion of Missing Data in Hydrological Time Series

“…The sensor networks, although reliable, are The solid performance, together with the ease of model setup, is highly beneficial when building models in areas that lack appropriate data for the setup of conventional hydrological models, especially experimental catchments, where the level of detail necessary for the model is often beyond the resolution of the available data. In this study area, this applies to the high level of generalization of the geological and soil maps or outdated land cover maps, which are typical data inputs for hydrological modeling [54,55].…”

A cost‐benefit analysis of afforestation as a climate change adaptation measure to reduce flood risk

“…The hydrological model-HEC-HMS (US Army Corps of Engineers, 2015)-is open access and has seen widespread use in catchment management around the world, including for flood risk management (Olang & Fürst, 2011;Váňova & Langhammer, 2011).…”