The function of this system includes possesses the following three modules:(1) decision-making of irrigation during ponding periodThis system is based on water depth of transplanting, infiltration volume, days, mean evaporation intensity and rainfall during ponding period to forecast irrigation quota during ponding period.
Experiment showed that the safety of mixture of acetochlor and bensulfuron to rice related with the dosage of mixture, application time, rice-transplanting depth, water depth and temperature after application.
This paper introduces altitude calculation formula for wind banked-up and sums up the basic formula. The relations among wind velocity,blowing distance,water depth and altitude value of wind banked-up is studied.
From tidal current physical model test, variations of flow velocity, flow pattern and tide in the basin and channel before and after the implementation of the Plan of North Yangshan Harbor Area were simulated. And also the variation of water depth of the channel is estimated.
For analyzing the impact degree and range on flow and concentration field, due to water depth near the project is shallow and many cays emerge periodly, the two-dimension water-quantity and water-quality computation model based on unstructured mesh was set up by using Osher's scheme of FVM which have advantages of universality, conservativity and upwindness.
The main construction method for offshore pipeline is the lay-barge method, but in offhsore area where limited by water depth, or in area where are not applicable for locating and anchoring because of the complicated buildings on sea or subsea, tow method is adopted.