Sensitivity evaluation of the flash flood warning system introduced to ungauged small mountainous basins in Korea

This study evaluates the uncertainty involved in the determination of the flash flood guidance(FFG) of the flash flood warning system(FFWS) for a small mountainous region(FFWS_MR)in Korea. The sensitivity is evaluated both at each step to determine the FFG and for all steps together. The results show that the relative difference of the FFG is about 50% of the current system, most of which involves the channel width. Especially, the use of some specific empirical equations to estimate the major parameters results in a considerable amount of the relative difference of the FFG. In addition, though only four basins were field-surveyed, it is found that the indirect estimation of the major parameters always introduces some amount of additional uncertainty. In conclusion, accurate estimation of the major parameters must be the most important procedure to derive an accurate FFG, among which the channel cross-section at the exit of the basin lies at the center.     

ON THE MAGNESIAN CONTENT OF THE PRE-GAMBRIAN MARBLE IN NORTH CHINA.

The senior author has, since several years,~1 pointed out the high magnesian content in the upper Wutai formation in which frequently occur     

A STONE METEORITE FROM NORTHERN KIANGSU.

Ⅰ. GENERAL DESCRIPTION. This meteorite is obtained from the province of Kiangsu. The weight is about 82 grams. The specific gravity is 3. 6. The shape is conical. This conical shape is evidently due to the atmospheric pressure which exerts     

THE NATURE AND EXTENT OF A STRATIGRAPHICAL BREAK IN THE CAMBRO-ORDOVICIAN LIMESTONES OF NORTHERN ANHUI,AND ITS BEARING UPON THE SYSTEMATIC CLASSIFICATJON OF THE CAMBRO-ORDOVICIAN STRATA

Those who have followed the historical development of the systematicclassification of the old Palaeozoic rocks in Europe would undoubtedly wellremember how the Ordovician became recognized as a well-defined,independ-     

A PETROGRAPHICAL STUDY OF THE CHINESE AGALMATOLITES

Ⅰ. INTRODUCTION. The most popular Chinese agalmatolites are Shoushanshih (壽山石), Changhuashih (昌化石), Chingtienshih (青田石) and Kwanglushih (廣綠石). They are named after the names of places, as the name Shoushanshih is from     

DATA RELATING TO THE STUDY OF THE PROBLEM OF GLACIATION IN THE LOWER YANGTZE VALLEY

In a commemorable evening—I believe it was in the early part of December, 1933—when I happened to discuss the problem of Pleistocene climate in China with the late Dr. Davidson Black, I informed him, without     

GEOLOGY OF KENKOU ON THE HUNAN-KWANGTUNG BORDER AND ITS BEARING TO THE OROGENY OF THE NANLING RANGES

INTRODUCTION In the winter of 1932 and the spring of 1933, the Nanling Mountain ranges covering the borders of Hunan, Kwangtung, Kwangsi and Kueichou were studied by the members of the National Research Institute of Geology,     

QUATERNARY GLACIATION IN THE YANGTZE VALLEY

Eleven years ago when this society held its Third General Meeting I had the opportunity of calling your attention to certain strange deposits and topographical features that came under my notice in certain parts of North China. I showed you a number of striated boulders that could not be attributed to mere     

DISTRIBUTION OF THE DOMINANT TYPES OF THE FUSULINOID FORAMINIFERA IN THE CHINESE SEAS

Since the publication of the Fusulinidae of North China much information has been obtained from the southern seas of this country of the Carboniferous and Permian Periods. We are now in the position to form a birds eye     

Experimental Investigation and Numerical Analysis to Develop Low-Energy Large-Midwater Trawls

Fuel consumption in fisheries is a primary concern because of its effects on the environment and the costs incurred by fishermen. Many studies have been conducted to reduce the fuel consumption in fishing operations. Fuel consumption due to fishing gear during a fishing operation is generally related to the hydrodynamic resistance on the gear. This means that fuel consumption is proportional to the drag created by the towing speed. Based on numerical methods, this study suggests a new approach to reduce fuel consumption in fisheries. The results of the simulation are in good agreement with those of model experiments. The total as well as partial resistance forces on the gear are calculated by simulation. The simulation results suggest improved materials and gear structure for reducing the hydrodynamic forces on the gear while maintaining gear performance. The method for assessing the gear performance involves measuring the height and width of the net mouth. Furthermore, this study investigates the efficiency of a low-energy trawl from an economic point of view. The findings of this study will be useful in reducing greenhouse gas (GHG) emissions in fishing operations, and thereby contribute toward lowering fishing costs by saving fuel.