فرسایش خندقی
Gully erosion mapping for the national Land and water resources Audit
gully erosion is a significant land degradation process and a source of sediment to Australian rivers. this sidement together with attached nutrients has affected downstream riverine ecosystems by smothering bed habitat reducing the diversity of bedforms and increasing turbidity and nutrient loads. erosion from stream and gully banks can generate up to 90 precent of the total sediment yield from a catchment . sediment that has been eroded from gullies since European settlement is still present in many rivers and continues to impact upon river ecosystem. Although gully development has slowed since about1950 .gullies continue to supply sediment to rivers
this study as a component of the National Land and water Resources Aidet(NAWRA) has produced predictions of gully extent Australia based upon extensive measurement from aerial photographs.gully density prediction was earried out Via the generation of numeric rule-based predictive models for four regions of Australia.these predictions of the location and extent of gully erosion should be useful in regional planning of erosion control. the end
