Evaluation of the Impacts of Land Use on Water Quality: A Case Study in The Chaohu Lake Basin

Abstract

It has been widely accepted that there is a close relationship between the land use type and water quality. There have been some researches on this relationship from the perspective of the spatial configuration of land use in recent years. This study aims to analyze the influence of various land use types on the water quality within the Chaohu Lake Basin based on the water quality monitoring data and RS data from 2000 to 2008, with the small watershed as the basic unit of analysis. The results indicated that there was significant negative correlation between forest land and grassland and the water pollution, and the built-up area had negative impacts on the water quality, while the influence of the cultivated land on the water quality was very complex. Besides, the impacts of the landscape diversity on the indicators of water quality within the watershed were also analyzed, the result of which indicated there was a significant negative relationship between them. The results can provide important scientific reference for the local land use optimization and water pollution control and guidance for the formulation of policies to coordinate the exploitation and protection of the water resource.

Economic Evaluation of Hydrological Ecosystem Services in Mediterranean River Basins Applied to a Case Study in Southern Italy

“…This time period is usually considered when assessing the territory protection from floods. Therefore, the volume of rainfall accumulated into the soil and removed from the runoff was calculated by subtracting the flow volume for different land uses from the rainfall amount, characterized by a return time of 200 years: WC = Vol rain − Vol runoff (2) where Vol rain (m 3 ) is the 200-year rainfall volume estimated on the basis of climatic possible curves and Vol runoff is the runoff volume through the stream gauging station, estimated through the "rational formula" described in Section 2.3 (assessment of surface runoff). The economic value of the flow regulating service has been calculated with reference to the WC indicator on the basis of the costs for the construction of a storm-water retention system with equivalent volume.…”

“…The concentration of pollutants in the surface water was assessed on the basis of the forest surface and other land uses within the same basin [2]. In particular, it is possible to estimate the chemical oxygen demand (COD in mg L −1 ) parameter, which describes the surface water pollution, on the basis of the following formula:…”

“…The coefficients used in relation (3) were determined by [2] through data processing related to land use and water quality. It is possible to estimate the total organic carbon (TOC in mg L −1 ) which represents an indirect measure of the organic matter in the waters by means of the ratio COD/TOC = 3.…”

“…The management of land and water resources are closely related [1][2][3], since the spatial planning addresses the localization of activities and the land use. The latter affects water balance, water quality, hydraulic risk and soil loss [3][4][5].…”

An integrated analysis of agricultural water-use efficiency: A case study in the Heihe River Basin in Northwest China

“…There have been extensive researches on water resources, including water protection, effective utilization of water resources (Huang et al, 2013) and evaluation of water security etc., particularly, the water-use efficiency has always been the core issue in different countries (Abu-Allaban et al, 2015;Kahil et al, 2015). At the early stage of the world development, water resource was regarded as "free commodity", while with the boom of global economy, the conflicts between water demand and supply have become fiercer, how to improve the water-use efficiency is becoming a very urgent task (Sun et al, 2014;Zhang and Wang, 2015).…”