In general, in the period from 1970 to 1999, decrease in precipitation is main reason that caused water and sediment reduction, and its influence account for 63.1% and 73.6% of total reduction of water and sediment respectively.
Study on water-sediment optimum allocation in upstream basin and comprehensive measures of sediment control in Guanting reservoirⅠ:Reservoir sedimentation and general plan of water and sediment control
Therefore, it is of vital significance to natural science and social economy to develop environmental and ecological researches on estuarine tidal flat. As a sort of environment boundary between water and sediment, the sediment-water interface is a very important region where physical, chemical and biological parameters of nature water vary sharply.
According to the data of the ecology construction in Changxing island of Dalian in Jul. 2002, a study on the disitribution characters of the parameters in water and sediment was done. The assessment on the environmental quality and nutrition status were made.
By the investigaton of current environment quality of water and sediment in the mariculture areas of Xiamen in summer 2004, we assessed marine fishery environment with Quality Index Method according to related national environment quality standards.
The performance of the model is evaluated by comparing the predicted and observed concentrations in the water and sediment of the Liao River.
Experiments that involved the addition of 14CH4 to water and sediment samples showed that a considerable part of methane is oxidized in the upper horizons of bottom sediments and in the water column.
Increased water and sediment pollution by industrial and sewage discharge were found to most significantly affect the abundance of larvae, food composition, and the availability of substrata suitable for larva to settle.
Assessment of Water and Sediment Quality in Fresh Water Bodies Based on Characteristics of Benthic Communities
The influence of the huge river water and sediment runoff and tides on the hydrological and morphological processes in the Yangtze River mouth is shown.