Jer Lang Hong

It is the aim of this book to present the use of computer-aided techniques in hydrologic modeling, with emphasis on the application of computer softwires based on physical and data-based hydrologic models which are publicly available to hydrological data of Malaysia. With the aid of a computer, complex hydrological problems are solved with speed and accuracy. Topics covered in this book include regional flood frequency analysis, regional low flow frequency analysis, flood and drought analysis, forecasting, flow forecasting, unit hydrograph methods in flood estimation, and missing streamflow data infilling using hydro climatological data.

With the advent of computers and modeling techniques, complicated problems in hydrology are solved with speed and accuracy. In this book general principles of flood routing are given but greatest emphasis is given to two river routing methods i.e. Muskingum and Lag methods which have the widest practical applications. The book gives examples of using computer program HEC-HMS of Hydrologic Engineering Centre 1] in calibration, validation of the Muskingum and Lag methods and the derivation of downstream hydrographs using data of upstream location. Data used were obtained from two gauging stations of Klang river at Kuala Lumpur, Malaysia. In short, the book emphasized more on practical aspects of using computer software in river routing and hydrograph design.It is hoped that this book will be useful for practical Engineers engaged in water related structure design and river basin studies. It is also recommended as a training document for water Engineers and University students.

This book analyses the shortcoming of existing methods for extracting information from web pages. Our analysis shows that existing methods use high level information from these web pages inefficiently, which ultimately degrades their objective performance. We develop a series of optimized extraction techniques which improve on the state of the art. Experimental tests show that our techniques can perform better than the existing techniques on a wide range of data records.