Human impact on sediment yield and channel dynamics in the Arno River basin (central Italy)

摘要: The Arno River basin has been subjected to human disturbance and modification since Roman times. Until 1800 the main aims of such modifications were provide flood protection for adjacent towns acquire new land cultivation. During nineteenth twentieth centuries underwent additional significant modifica­ tions, including reforestation, upland sediment retention, a huge increase in bed material exploitation, construction two reservoirs bank works. combination reduced supply increas­ ed transport capacity resulted extensive streambed degradation that threatened stability several bridges other structures. In order identify dominant channel changes relationship between verti­ cal lateral adjustments, comparison many cross-sections spanning period more than one century was made. relative importance activity causing adjustment compared with natural changes, as progressively lower runoff recorded during last seven decades, is discussed.