Yichang city is located in western Hubei Province, is situated at intersection point of upstream Yangtze River and the middle reaches, the transition zone from mountain area to the plain area.
宜昌市位于湖北省的西部，地处长江上游和中游的交汇处，鄂西山区向江汉平原的过渡地带。
2
The suspended sediment concentration at the center of the turbidity maximum zone and near the sand bar tends to increase because of the sediment addition from upstream.
因上游来沙量增加，在最大浑浊带中心和河口拦门沙处悬浮泥沙浓度趋于增加。
3
The products of the upstream reaction zone are conducted to a downstream reaction zone and combined with fresh feed in the downstream reaction zone.