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Factors Tidal and Rainfall

Rise and fall of sea level periodically during a certain time interval is called tides. It is also said by Bhatt (1978) that the tide is the period of the rise and fall of sea level which is the result of the attractive force of the earth and the moon, and a small part due to the gravitational pull of the earth and the sun. Friedrich (1973) states that the tides can enlarge or reduce the movement of other currents, this phenomenon appears particularly in coastal waters.

In general it can be said that the power of the tidal currents influenced by the ups and downs. According Nontji (1993) there are several factors that affect the nature of tidal including ocean depths, the position of the moon and sun’s position relative to the earth and the beach. All of these lead to deviations from ideal conditions and can cause tidal characteristics which vary from one location to another.

In relation to the biological phenomenon is said by Friedrich (1973) that the direct or indirect effect on marine biological phenomena, such as distribution and succession of organisms. Tidal frequency is also one of the factors that affect the life of seaweed in the intertidal area. In the semidiurnal tide that exists at a greater frequency than the diurnal tide is supporting a variety of seaweed population.

Handoko (1995) states that the general pattern of rainfall in Indonesia, among others, influenced by the geographical location, in detail the general pattern of rain in Indonesia, namely the west coast of each island to obtain the amount of rain is always more than the east coast, rainfall in western Indonesia more greater than the eastern part of Indonesia. The rainfall also increase with altitude. Rainfall is generally located at an altitude between 600-900 m above sea level, in the eastern part of South Sulawesi, Southeast Sulawesi, Central Maluku, different rain season, the month of May-June.

At that time, other areas are experiencing drought. As for the intensity of the rain categorized into 5 categories, namely in table 2 below.

Table 2. Categories intensity of rainfall in Indonesia

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Intensity of rainfall is good for the growth of seaweed that the light intensity of the very mild to the transitional season between the dry-season rainfall (Sulistijo and Atmadja, 1996).